Like I said above they will do till I get to Williams again.
I don't know if they are on back wards or not as they were on the rifle when I bought it. I just know that the fouling the scope gets on my 54 is stopped by the mounts on the 50. A real crappy place to get into and clean good too.
I have always used the Weaver mounts till I bought my first set of Williams mounts.

Al