I just bought a new one for a 92 SSE and it is a 3 wire sensor. Paid about $20. They are tricky to find in the parts book. Not sure why they had to list it under "Modules" I'll let you know if it works.

Tumbleweed

I ordered this thing Thursday morning, parts clerk said id get it friday, so i went to pick it up. "Nope it wont be here until saturday morning for sure". That kinda sucked i was hoping to change it before work. So saturday gets here and still no freakin part. Talked to the manager, now he says monday. GM said id get it next day and iv never had a problem with them. Lesson learned, I need something let the dealer help me