http://www.properparts.com

Regarding the 6-Way Power Seat Transmission for General Motors, available as two part numbers, there is a simple method to confirm the part number that you want:

• GM part number 20113446 ... production years 1979 – 1980:
• Plastic input shaft, colored black.
• Proper Parts part number GM-T7981R.

• GM part number 20225150 ... production years 1981 – 1988:
• Plastic input shaft, colored red or yellow
• Proper Parts part number GM-T8188R.