I am trying to put one of those adjustable pinion snubbers on the center section of an 8.75" axle, but I cannot find the bolts that fit. Ive gone to the store and got 5/16" and 3/8", but one is too small and one too big. The 5/16 feels like it is grabbing then pulls out. I am wondering if this could be a 11/32" bolt or what the heck? Please help.