[AZKen]

Amazon has them almost as cheap. Maybe cheaper if you have prime. Calculate both with ship. I would buy Amazon before Rockauto. I don't like them anymore. That's another story.
What do you mean "only on the starter side"? Meaning starter not engaging far enough you think? I guess motors stop in about the same places so that's why it's only 1/3 of diameter. F/W's are pretty cheap so that's good. Starters may be hard to find but a new starter drive (I call Bendix) is available for your starter at Amazon also.