I got 71B 5 speed bellhouse from one of my friends. I decided to move onto 240SX transmission swap into my 280z. First of all, bellhouse comparison. It looks like there are several different 71B bellhouse with a bit different pattern. This is my original 71B 4speed. It's written "L2" This is the 71B 5speed bellhouse I got. It also written as "L2" This is 240SX 71C bellhouse. It written 71B... with some animal? I found some pic in internet that is written 71C for 71C bellhouse.