You don't want one of those. If you have the slightest oil leak back there or over grease the u-joint, your shoes and suit legs are a nasty mess. Plus they are a fabricated piece, which means they can break. I think you would be much wiser to run a regular ball and casting set up. You can usually just clearance inside the casting a little bit for the small counterweight on the back of the GM crank. We forgot one time, but it clearanced itself.