I went with a T56 out of a 2000 Viper. I basically just cut the whole tunnel out and put a new one in because they had butchered a 4 speed hump into my car before I got it and it was just pretty messy. It seemed easier to just make a new one vs modifying the stock one, though I'm not not a sheet metal person by any means. I had to remake the upper transmission crossmember too, so having the sheet metal out of the way made it easier to work with.
