buoymaker, I haven't the experience with the rear axle bearings yet to answer the questions about fitment and installation, but did check to see what is being offered for replacements for the GM# 111121 bearings. You might check this offering FS-315 that the Filling Station lists as a direct replacement for the original GM# 111121 and alternate Hyatt OR1502.

On another note, I did find this listing that seems to indicate the R-1502-El is a compatible interchange. This same number is also listed for cross referenced as a replacement for the Hyatt C1502 (current designation for the original Hyatt OR1502 number). Anyhow, hope this might help answer part of your questions about fitment. wink

~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)