Bonnie SSEi 1992 with 54.000 ml on it. VIN 1

I´m looking for advices about the best brands for the O2 sensor (1wire before catalit) and a fuel injector set that fit my car above listed.First of all I prefer to buy OEM parts (What brand?) and as a second option a aftermarket parts.
Regards Malachias (Brazil)

Single wire o2s are really cheap. Might as well get tha a.c. delco.