Hy Hevyhauler, I'm a psychic, actually I have a master bearing interchange book, when I tried to look one of these up using the Hyatt numbers, nothing, so I used the original G.M. numbers and presto. I'm not saying that these are exactly the same, their just whats listed as interchangable.
Hy tclederman, the inner seal number I come up with is National p/n 6785, but my book only goes back to 1955
