I found I have one of the original 60's grommets, it has the angled hole and is for a speedometer cable. It fits a 1" hole however, not 1 3/8". I am gonna guess that it came from my 62 Chev pickup, I have seen this size in a lot of GM cars. That doesn't help your 1 3/8" hole but maybe someone else. I would mail this one for a couple dollars to cover the postage, I will never need it (at least until after I send it to someone else!)
