Nope. Dr. diff's brakes can be used with the stock tapered bearings or green bearings. It's posted clearly on his website and I've even confirmed by talking to him directly because I'm keeping my tapered bearings and will eventually go to rear disks. Most of the other kits out there require green bearings though. The mounts appear to be one piece as well, although I haven't installed a set and didn't think to ask when I talked to Cass about them.