Replacing the seals is the cheapest and best option in any event.
Funnily enough, the SW20 MR2 was imported into the USA with a 5S-FE engine as well, so that may be where the comp. compatibility reference comes from.
The 5S-FE is found in the 182 and 202 series Celica's, and the SD, SDV 10 and 20 series Camry's, to name a couple of common ones. My EPC will not show Aust. production part numbers so whatever I can come up with will be an oversea's model.