That one says 37 to 39 if your tube is a 1950 it will be this one .Also the newer tubes 51to 54 are a bit bigger diameter so also different part .one way to tell your tube is a. 1950 is it will have dowel a dowel pin to hold the original bushing in the tube ,two pins one for each of the origional bushing as the origional is two instead of the newer oakie style .with the oakie you only need to remove the dowel closest to the tranny end as the other old bushing stays in .I never done this yet but read a lot of posts .Also measure the tube and new bushing before to make sure it will fit .There are a few videos on this also .
