O2 Sensors
 

i need to replace both o2 sensors the ones b4 the cat....anyone know where i can find AC Delco ones online for a pretty good price?

dealer probably, unless you get a number and go on gm parts direct. Ive only seen the ****** bosch ones at the local stores.

Dealer if you want to pay list price. gmpartsdirect if you want to pay a low wholesale price with ridiculously high shipping. Otherwise, try these two sources:

http://shbox.com/1/4th_gen_tech2.html#Dal_and_Jason