Just saw a set of 13" factory RX-7 wheels on ebay for cheap.
BUT, they are the very cool looking version that looks like the wheels
that Abarth used to put on the hot FIATs. You don't see too many like
this since Mazda updated their look fairly early in the RX-7 game.
I don't have a link but if you search the wheels section they are in
the 14" and under section of the wheels & tires category.
Oh, also, they aren't mine. This isnt a plug for a personal auction...