I fitted these extended studs to a 1988 Pontiac Fiero for use with open ended spacers and nuts. These studs are M12x1.5 threaded with a knurl diameter of .509", length under the head of 2.50" and knurl length of .315". The ARP FAQ on the web says that when pressed into steel - or iron hubs must use a hole 0.005" smaller than the bolt knurl. The 2" sweep is pretty close, but a bit tight. I was able to push the studs into a slightly smaller hole and it worked fine, but it's probably better to get the right reamer. The current pic in the Revain listing shows them with unthreaded lugs but that is inaccurate. These are NOT rounded end studs. The threads reach the end of the hairpins. The ARP catalog confirms these are not round studs. Revain is simply using the wrong image.
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