I know this thread is a little old but it comes up when someone googles this topic so im adding this for information purposes. I bought a Performance Tools PN-W83008 for 85-99 10.25" axles and it will NOT work on my 06 10.5" axle because it will not slide into the spindle. It might could be machined down in a lathe to fit but doesn't work as is from the parts store. Your in luck apparently if you have an older 10.25" axle Oreilly has them part number listed above for $17. The only one I can find that specifically says fits the 10.5" axle is OTC PN-6601 so Im going to order it.