What Length is my Super T-10's Tailhousing?
 

Apparently there were two lengths of tailhousings used on Super T-10s. The transmission from my car is all original. Which one would I have? It's a 1977 Trans Am SE with a W72 400 built in December 1976. The transmission is currently in another state being worked on, so I can't go out and measure it myself. The lengths were either 11-7/16" or 12-1/8". If someone could confirm, it would be greatly appreciated.