I messed up the threads on this bolt while removing it. Can anyone tell me where I can find a replacement? It's one of a pair of bolts that hold the lower suspension (the piece the torsion bar attaches to) to the spindle (axle) on my 1968 Newport. Edit: The bolt is 5/8-18 and about 2-5/8" long with a split pin hole at the end. Thanks!