I installed The 6 lug P.O.L. kit on my 50. Calipers did not clear later 15 inch wheels I had on the truck at the time.

here is a thread discussing 16 inch stock wheels
https://www.stovebolt.com/ubbthread...;Main=95965&Number=672507#Post672507

That Buffalo Enterprise tip may be a good way to go.

Good Luck