Bump: In another thread it was mentioned that polyurethane glue can be added to OEM rubber bushings to make them stiffer. This is a great idea to apply to the newer style axle bushes as purchased from VW. Fill in the voids effectively making them more solid, and perhaps more durable than Poly. So for those that are planning on this, it's an idea vs. going poly or spherical. Though from a price point, a tube of polyurethane glue and oem bushings come to the same amount as poly's and are a pain to install!