I have a 1957 Ford distributor ( FEK-12127-A ) I believe it is 1957.  I have been to 4 different auto parts stores looking for a rotor.  A seen to be to large and when placed on dist. is loose. I think the 56 and earlier and 57 the clip was done away with.  So way is it so hard to find a rotor that fits?  Any Ideas on what or is the others that had this problem and how did they deal with it? I figure some kind of shimming but wondering what to use Don't what to mess up dist.  Open for your help.  Thanks, a great sight for us that need answers.