Shock Absorber Mounting Types Explained: Eyelet, Bar Pin, Stem, and More

Understanding Shock Mounting Types

You found the right shock absorber for your vehicle, the right brand, the right performance level, and the right price. You open the box, hold it up to the old shock, and something's wrong. The top mount is a metal loop, but your vehicle needs a rubber bushing with a bolt hole. Or there's a threaded stem where you expected an eyelet.

This is one of the most common reasons customers return shocks at Shockwarehouse, and it's completely avoidable once you understand mounting types.

Why Mounting Types Matter

A shock absorber does its job by connecting two points on your vehicle's suspension, typically the frame or body, upper mount, and the axle or control arm, lower mount. The mounting type determines how the shock attaches at each end.

The upper mount and lower mount on a shock can be different types. For example, a shock might have a stem mount at the top and an eyelet at the bottom. When you're shopping for a replacement, both the upper and lower mounting types need to match your vehicle exactly.

Get it wrong, and the shock literally won't bolt up, or worse, it'll appear to fit but won't be secure.

The Main Mounting Types

1. Eyelet Ring Mount

• What it looks like: A round metal loop, or eye, at the end of the shock, usually fitted with a rubber bushing.
• How it attaches: A bolt passes through the eyelet bushing and threads into a bracket on the frame or axle.
• Where you'll see it: This is the most common mounting type, especially on trucks, SUVs, and older vehicles. Both upper and lower mounts can be eyelets or just one end.
• Key detail: Eyelets come in different inside diameters. The most common bushing IDs are 1/2", 5/8", and 12mm. Make sure the bushing size matches the bolt on your vehicle.
• Common vehicles: Chevrolet Silverado rear, Ford F-150 rear, Jeep Wrangler front and rear, Toyota Tacoma rear.

2. Bar Pin Loop Mount

• What it looks like: A flat metal bar with a hole in it, like a flattened eyelet. Sometimes called a "loop" mount.
• How it attaches: Similar to an eyelet, a bolt passes through the hole, but the flat-bar shape means it can only be mounted in one orientation. The bar sits in a channel or bracket on the vehicle.
• Where you'll see it: Common on many domestic trucks and SUVs, especially GM and Ford applications. Often used at the upper mount.
• Key point of confusion: Bar pins and eyelets are NOT interchangeable, even though they both use a bolt-through design. A bar pin won't fit in an eyelet bracket and vice versa. This is one of the most common mix-ups we see.
• Common vehicles: Chevrolet Silverado front upper, GMC Sierra front upper, Cadillac Escalade.

3. Stem Mount

• What it looks like: A threaded metal rod, or stem, extending from the top of the shock, with a rubber bushing around it.
• How it attaches: The stem passes through a hole in the vehicle's body or frame. A washer and nut secure it from above. The rubber bushing isolates vibration.
• Where you'll see it: Very common on the upper mount of front shocks on cars and some trucks. Most sedan and coupe applications use a stem-top mount.
• Key detail: Stem diameters and thread pitch vary. Don't assume a stem from Brand A will match the mounting hole designed for Brand B; always verify the diameter.
• Common vehicles: Honda Civic front upper, Toyota Camry front upper, Ford Focus, Chevrolet Malibu.

4. Cross Pin Bayonet Mount

• What it looks like: A metal pin that extends horizontally through the shock's mounting end, with a bushing on each side.
• How it attaches: The pin sits in a slotted bracket. Sometimes retained with clips or cotter pins.
• Where you'll see it: Less common today but still found on some European vehicles and heavy-duty applications.
• Common vehicles: Some Mercedes-Benz and BMW models, as well as certain heavy-duty truck applications.

5. Stud Mount

• What it looks like: A threaded stud extending from the body of the shock, not the rod, usually at the lower end.
• How it attaches: The stud passes through a mounting bracket, and a nut secures it. Different from a stem mount, a stud extends from the shock body, while a stem extends from the piston rod.
• Where you'll see it: Some European vehicles and certain truck applications.

6. Plate / Flange Mount

• What it looks like: A flat metal plate with bolt holes, welded to the shock body.
• How it attaches: Bolts through the plate directly to the vehicle's mounting surface.
• Where you'll see it: Some heavy-duty and specialty applications. Less common in standard passenger vehicles.

Top vs. Bottom: They Can Be Different

Here's what trips up many customers: the same shock often has different mounting types at the top and bottom.

For example:

• FOX 2.0 Performance Series for Jeep Wrangler JK rear: Eyelet top, eyelet bottom
• Bilstein 5100 for Chevrolet Silverado 1500 front: Stem top, eyelet bottom
• KYB Excel-G for Honda CR-V front: Stem top with fork mount bottom

When looking up shocks, always verify that both the upper and lower mounting types match your vehicle.

How to Identify Your Current Mounting Type

The fastest way is to look at your existing shock:

1. Get under the vehicle safely supported on jack stands and visually inspect the top and bottom of each shock.
2. Look for the bolt pattern: Is there a bolt going through a ring? That's an eyelet. Is there a flat bar with a hole? That's a bar pin. Is there a threaded rod going up into the body? That's a stem.
3. Take a photo. If you're shopping online or calling us, a photo of both ends of the mount instantly eliminates guesswork.
4. Check your Year/Make/Model listing. At Shockwarehouse, our product listings specify the mounting configuration for each application. If you see "Top: Stem, Bottom: Eyelet", that's exactly what you need.

The FOX Eyelet vs. Pin Confusion

We see this one a lot: customers ordering FOX shocks and receiving an eyelet mount when they expected a bar pin, or vice versa. FOX offers multiple configurations for the same vehicle depending on the specific model year, trim level, or package.

The fix is simple: always use the Year/Make/Model lookup rather than searching by part number alone. And if you're unsure, call us before ordering. A 2-minute call can save you a week of back-and-forth shipping.

What Happens If You Install the Wrong Mount Type?

• Best case: The shock simply won't bolt up, and you realize the mistake before anything goes wrong.
• Worst case: You force-fit it with improvised hardware. The shock might appear to work, but the mounting isn't secure. Over time, especially on rough roads, the connection can loosen or fail entirely. A detached shock absorber is a safety hazard.

Never modify or adapt mounting hardware to create an incorrect shock fit. If the mount type doesn't match, you have the wrong part.

Quick Reference: Mounting Type Summary

Final Tips

• Don't guess. If you're not sure which mounting type your vehicle uses, check the listing details, read the product description, or call us.
• Photos are your friend. Snap a picture of your old shock's top and bottom mounts before shopping. Compare them to the product listing images.
• Year, Make, Model, and Trim all matter. The same truck in different trim levels can use different mounting types.
• Measure the bushing ID. If ordering an eyelet-mount shock, confirm the bushing inside diameter matches the bolt diameter on your vehicle.

At Shockwarehouse, every product listing includes mounting type information for each application. If something doesn't look right when you open the box, call us before installing. We'll get you the correct part fast.