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I am sorry for digging this up from the past, but I am running into the same issues and was hoping someone could help out.....Yamaha V6 said:The short ones are what come for the std Taurus, and you don't get full threads from them.
I went looking at multiple stores this past week for new studs for my 91, as the ones on the new hub were the shorties. I've found correct long ones that were undersized (no grip in the hub holes) and oversized (too thick to pul through the hub without a press, and I've already mounted the hub in the new wheel bearing & 94 knuckle).
I'm banging out the studs from my old 91 knuckles now for future use, as it's a PITA to find what I want.

That is what I figured.... I found an older set of hubs I had from a Gen II spindle assy I bought a while back and popped a couple out. Sure enough, I had two different sizes.Shoaz said:FWIW, I got two boxes of hub+bearing from NAPA and each one had incompatible studs in them. i.e., one had holes too big for stock studs
I have been shopping for a couple of days doing just this. I wanted to replace all of them on this hub being that I assume they have all had a rough ride (one sheared off and the others were loose when I got it home. I ended up chucking one of the new 1/2" x 20's in a drill and then used a file to shave a couple thou. off of the splines. At least now, I have a backup plan in case I can't find anything in the morning. Thanks for the reply.Shoaz said:If you need to replace a stud, take what remains of the old one and try to get it matched up. If you know you have a stock hub, then a plain Taurus stud should work.