Thanks a lot!
Just what I needed.
So here is the finished reference chart for polished:
5100030 5/16".............45002-65A: small cable hole (1965-1967 FL)
5100031 3/8"..............38604-65A: large cable hole (1965-1970 Sportster)
5100032 7/16"............38604-71: medium cable hole (1972 Sportster)
The stock 73FLH control measures about 3/8" so it looks like it should match up to 38604-65A.
Funny that the 'medium' cable hole is bigger than the 'large'.
Oh well
Thanks and I'll let you know if it works..
Chris