Great. The more information the better. I have added the Hastings LF405 to my list of acceptable filters:
AGCO Allis 240912 (corrected version)
NAPA 1101 (old design ONLY)
WIX 51101 (old design ONLY)
Presumably any of the above will work correctly without a noticeable loss in oil pressure. They have been provided by posters who are knowlegeable about the problem on this and "the other" AC board. I have not personally verified them all.