Oxygen Sensors for 1995 K2500 burb?

I have a few questions related to oxygen sensors for a 1995 Chevy K2500 Suburban with 350 TBI engine:

1. What is a good brand and part number to look for?

2. How many do I need?

Thanks.

NipponDenso, AC Delco, Bosch..... take your pick You should only need 2 because you have TBI. One pre-Cat and one post-Cat O2 sensor. You would need 4 if you have Central Sequential Fuel Injection.

Thanks Spit,
I had found 2, but several people had told me there were 4 and I just couldn't find the other 2.... now I know why.

Bill