I just took my 1950 FW apart - the hook base is 45752, not even the same number as in the parts charts.
Most of the hook parts that I can see numbers on (this far disassembled) are all different than the 301. Unless one number supersedes another I wouldn't have ever thought to interchange them based on the parts charts, and confirmed by what I see here.
Additionally, the parts chart says I should have the new bobbin case in the 301 (45751, not 45750) and it's the old one in it.
I guess the moral of this story is DBaila - make sure that the parts your local shop puts in are 301 parts and not 221 parts, and the correct part numbers may be a challenge to find out.