I purchased them for my previous car and used them with my Koni sports. They'll work just fine with other shocks.

Basically, what you get is an integrated rubber bumpstop and bellows type dust cover. They come with zipties to tighten them down to the shock. I remember that the bumpstop is pretty long though....so if you're lowered you might consider cutting it or doing something of the sort.

I'd say they're worth it if you want to increase the lifespan of your shocks' dust seals...they're just kind of pricey for what they are.