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Originally Posted by 63gmc4x4
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Had a little time today to look into this Ebay posting. Looks like I was a little too hasty in my previous post. I sincerely doubt this will work (see picture for comparison).
Under "Item Specifics" of the Ebay listing it gives a manufacturer part number of RS29025 which is ROL brand. The interchange that they list is BS30136 (Felpro) and JV723P (Victor). I recognized these as the Ford V8 260, 289, 302 ci rear main seal. I have a BS30136 on the shelf so I thought I would compare.
Here's what I found. The Ford is much larger over all, however it has a thinner width .230" compared to the GMC seal which has a .290" width.
FYI. The old Victor part number for the rubber seal is JV616. I looked back in my Victor catalogs and this Part number doesn't appear until 1973. It appears prior to 1973 only the rope (Victor p/n JV716) was available, but the rubber should work retroactively for earlier engines.