Chicago Rawhide and National who are the two largest USA seal suppliers put out several cross over books
One from OEM part numbers to theirs.
Another cross references from size to manufacturers numbers.
Also Cr produce another publication on sizing for speedy sleeves which have to be one of the greatest inventions since the war. What is not commonly known that if the shaft is out of limits for roundness, the sppedy sleeve will bulge up and make the shaft unusable. When I worked for Kenworth we did not bother with micrometers if the sleeve went on OK then you could be sure it would not leak.
regards
Col
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Vietnam Vet and proud of it.
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