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You can also trim some height off of the upper rubber mount.
As I should know, they can be cut. However, the shape of the part and what it is made of make's the prospect of just triming them a little bit, next to impossible. The only way I was able to get a consistent cut was to follow along the valley's between the parts deep ridges, meaning about 3/4" of material. Remember it's basically a huge chunk of car tire, and even using a hacksaw requires stopping and drenching the cutting gap with wd40 to free up the blade stops dead often. So a band saw is out, as is trying to grind it down. Grinding it down just vulcanizes the rubber and spites out the stickiest tar substance you'll ever run across, doesn't wash off for anything either and if it doesn't do that you'll get coated in a blanket of what looks and feels like coal dust all the while making stunningly slow progress. No, one hacksaw pass, taking 3/4" off, then back filling with shim's to get the drop amount you want is the way to do it.
In this picture the car is on oem 350Z springs in the front and dropped in the rear on oem sedan sport springs with 3/4" removed from the rear upper spring seats to give a 3/4" rear drop.
