Terry is right they are supplied with Eibach but they only make the spring contracted from Ground Control. It is a different design based on Ground Controls engineering and standards, they are not the same spring you get if you just order Eibach. I do not believe H&R's will fit on the perches (youd have to buy the complete kit anyhow). Sitting here looking at them (uninstalled, waiting for the updated bearing to be released)I believe the coil is much smaller in diameter then my friends Eibach's. Hope this helps.
