LT77 is the run of the mill Rover 5 speed, found in a few cars, Sdi, TR7s TVR wedges, Morgans, Sherpas, any thing really fitted with a RV8, 99% of all 2wd 5 speeds from BL, Other wise the 5 speed is found on all non V8SDIs apart fron the 2.0, which sometimes had 5th gear blanked off, Sherpa boxes have a short 1st gear and a cast iron remote, Jags have a short ally remote, but they have an odd bellhousing which needs to be changed, I have even seen the box fitted to a Moris Ital, MGRV8s have a R380 box, which is a upgraded LT77, you will be unlikely to find one of these,
Later TVRs and Morgans were fitted with the R380, and also the BorgWarner T5
Might be a helpful link,
http://www.v8forum.co.uk/forum/viewtopic.php?t=2028
The whole site is unintentionally biased towards to RV8