Thanks for the response, Bob. I find the SKF/Chigaco Rawhide web site search below the best out there. I figure they make most of the seal sizes worldwide!
https://www.skfextranet.com/crsealsf...35X78X8+CRW1+R
And, yes, I recently went through the exercise of buying oil seals for a Centurion gearbox and final drive. Like you say, our supplier couldn't get the sizes needed because the seal dimensions made 70 years ago are not available today, so we ended up buying the right shaft size and machining spacers to adapt the seal ODs to the housing bores. Looks like we'll be doing the same for some of these HUP seals.
Malcolm