I bought this for my FD3S after the original one gave up, it was the most competitively priced radiator for a RX7. Had to move things slightly but fitted with no problems and was able to use the standard twin fans. Only thing for RX7 it doesnt have the Air Seperation Tank take off but I bought something to bypass it anyway.
Basically, cool keyring and stuff, but the bit of the keyring that goes around the loop looked quite thin and today I finally noticed it had dropped off. I'm not fussed like but it might be worth making it a bit thicker though. Just figured it would be worth letting you know.