I just bought a 12 bolt rear end for a 69 camaro but, the rear end is pretty beat up! The possi unit inside or 3rd member or what ever you call the thing that carrys the spider gears and clutches is broken. It has a hole in it and the gears are stripped like if the rear end was used for the drags or racing. Do you know anybody or any store that sells this part without costing an arm and a leg? Please help! Too much money wasted on the 12 bolt unit.Thanks!