You may be saying 58-62 because that is when the oil cap was in the middle. Found one oil breather filter assembly on a 1956 GMC 270, pickup. Supposedly original. Found others on WWII GMC big trucks. Also a 1941 CCKW, 270 motor. These have a little different configuration. A piece is offset?? This is a stumper but a really neat accessory to have.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn