1.8 FP, 2.0 FSDE, 2.0 FSZE will all drop in. you need to be careful how old of an FS you buy because car won't run without the provision for a cam sensor and with the distributor on older engines. your best bet is a 98 and up FS engine from a Protege or 626. running the 1.8 or the FSZE on the mp3 ecu really isn't advisable if you ask me. 2.0s are so plentiful that there isn't hardly any reason not to just replace it with one.