This is the 1330 series pinion yoke that some of the GM HIGH PERFORMANCE cars got on the 12 bolt differential. Top quality, brand new 1330 series yoke for your 12 bolt car rear.  If you do not have the larger 1330 series driveline than this is going to be too large for your application unless you are willing to upgrade your drive shaft and slip yoke. If you have the 1330 High Performance driveline then here is your new replacement yoke.