Tremec 6 Speed Reverse Lockout Assembly Bolt.  #E4 on the T56 Transmission Disassembled View  

Complete Tremec Reverse Lockout Assembly.  Includes E3-1, E3-2 and E3-3 on the T56 Transmission Disassembled View  

Tremec T56 Electronic Speed Sensor, 2004-06 GTO, 2004-07 CTS-V.  #E7 on the T56 Transmission Disassembled View  

Tremec T56 Transmission Extension Housing, 96-2002 F-Body, 2004-06 GTO #A44 (better known as a tailhousing) for 96-02 F-Body & 04-06 GTO.  Includes output shaft/slip yoke bushing.  #A44 on the T56 Transmission Disassembled View  

Tremec T56 Speedometer Rotor Gear for 93-02 F-Body and 04-06 GTO.  #81 on the T56 Transmission Disassembled View, seen here, here and here.

Tremec T56 Extension Bearing Washer / Spacer for Rear Mainshaft Bearing, Nylon (replaces steel spacer), requires 2.  #A5 on the T56 Transmission Disassembled View  

Tremec T56 Rear Mainshaft Extension Bearing Assembly Includes Mainshaft Roller Bearing & Outer Race.  #A4-1 & #A4-2 on the T56 Transmission Disassembled View  

Tremec T56 Thrust Washer, Rear.  #A8 on the T56 Transmission Disassembled View  

Tremec T56 Mainshaft Reverse Gear,  35 teeth. #A9 on the T56 Transmission Disassembled View  

Tremec Reverse Gear Needle Bearing.  A10 on the T56 Transmission Disassembled View  

Tremec Mainshaft Reverse Gear Bronze Blocker Ring for all T56 Transmissions.  #A14 on the T56 Transmission Disassembled View

Tremec T56 Plastic Thrust Washer that fits between the reverse gear A9 and reverse synchronizer assembly A15. Not shown on the T56 Transmission Disassembled View