I need to find a replacement for an legacy (1970s) Ferroxcube pot core. The part number is 3H1-4322 022 02200. I could find the part for the first 7 digits but not the last five >02200 which deals with the gap, I think. The core material 3H1 ist still made today.

 

This is a common problem as manufacturers get taken over or simply change there part numbering system. You have an advantage knowing the material so the best solution is to match on dimensions (of the core), you will come up with a list of candidates and hopefully one of them will have a part number that clicks (same but jumbled around and maybe more/less letters & numbers)...good luck