What is the difference in front and rear calipers for a mid 70s FL?
Can I use a rear on the front?

I have a 1975 FX with a left side drum hydra-glide front end that a previous owner installed.
I am swapping a pre 77 41mm FL Shovelhead single disc front end on it.

My problem is I have what appears to be four rear calipers!
They all have Rs stamped on them.

I also have a 1973 FLH that I have owned for 19 years that is very close to being 100 percent Harley, the front caliper looks to be the same as the back?

Thanks,
Gregg

 

There different... front caliper is 44104-72A. (1972-1984)

rear caliper is 44105-72. (1973-1980)

 

One of the calipers I have has an "S" stamped on if where you would normally find a
F or R stamped, WTH?