If the transmission is original you need a 3774720 synchro hub. However you need to look at the synchro. 1952 and earlier used a 2 lug syncho, 53 and 54 used a 4 lug synchry and 55 and up used a completely different synchro. If this is what you have the 3774720 should fit. They are getting scarce, but there are a few NOS around and some good used. 50 years ago, I replaced a lot of synchro rings, but now I would just replace the whole syncro hub. If you can't find anything, take a photo of what you have. i probably have one.
