GM O2 Sensors available from S&P or your local AC Delco/GM Dealer
A. Throttle Body ~T.P.I ~'92-'93 LT1 (One Wire)GM# 25166816 AC DELCO# AFS21

B. Throttle Body ~T.P.I ~'92-'93 LT1 (Three Wire)GM# 25176708 AC DELCO# 213-632

B2. S&P Pig Tail to convert from One Wire System to a Heated Three Wire System

C. '94-'96 LT1 Vette~ '94-'96 BUICK, CAD., '94-'97 IROC/TA, '96-Up Vortec (Four Wire) O2 Sensor GM# 25312184 AC DELCO# AFS-75
C. is also used for '97-'04 LS1 Factory Corvette Engines - S&P LS1 Harness uses IROC O2 Sensor (D)

D. '98- '02 LS1 IROC/TA Engines GM# 25312197 AC DELCO# AFS98

E. '05 LS2 with Square Plug GM#12587785 AC DELCO# 213-1702