If you are wondering if you have Nivomats, check your manual, or try to get a look at them. They will only be in the rear. Nivomats have a thinner end toward the eyelet (although Monroe Nivomats and some others have a built-in accordion boot cover). If you can't see the entire unit and you don't want to take the tire off, but you can see the bar code, try scanning the bar code with your smartphone and a cheap or free bar code reader app such as Barcode Express.
If your vehicle has manufacturer-installed Nivomats, these will need to be replaced with Nivomats, because these shocks (unlike most) actually help hold up the car. If you replace them with non-Nivomat technology your rear end will sag. That's right, your rear end will sag. Nobody wants that.
The Nivomat is on top.