Both Timken and SKF have cross ref tools on their websites. The GM part number for the seal is 379654 which crosses over to 20669 for SKF and 5756 for Timken. I used cross ref tool when I bought new seals for my truck, just can’t remember which ones I bought. I would still confirm the dimensions to make sure.

Dave

1966 Chevrolet Caprice 2 Door Hardtop (396 Big Block)
1951 GMC 9434 5 Window (waiting on a 292 transplant)