s2k drifter

Sup, I have a 96 civic hatchback with a 96 gsr swap. I recently changed my obd2 p72 to a obd1 p72. I thought that would fix my check engine light problem but it didnt. I guess im ready for a new o2 sensor, problem is I havent gave it much thought till now. Seems like the prices for these damn things are kookoo, so im thinking of checking ebay. Any clue which o2 sensors would fit on my car other then the original 96 gsr? Would I be able to use a 94-01 integra? Maybe a 96-00 civic? I just need the primary so if anyone out there has one for sale, let me know.