I know all of ya'll are losing sleep over this so you will want to hear this. :-) I ordered an S4 bearing from Mazda Comp Parts and it is clearly the thicker one, as Jim said. Its markings are JAPAN, NTN, and HHH and it is part no. FE84-16-510. $18.25 delivered. The one I took off, that had gone bad, was the thinner S5 one.

Jim, what SS car do you have?

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Bill Denton
87/89 ITS RX-7
02 Audi TT225QC
95 Tahoe
Memphis