I am looking for the proper oil filter to use on a 1943 Hale WW-II OCD trailer pump. It is believed to have a Chrysler Type T-109-501 engine in it. The manuals I have do not specify the oil filter.
When I got it the oil filter on it was an AC P-21. The (presumably) equivalent replacement on it now is a Motorcraft FL142.
Does anyone have information on the oil filter that was originally specified? Or can direct me to a good cross-reference directory. So far cross-references have found zero results.
Thanks.