part numbers are 7-digits
vendor codes are 5-digits

the 7-digit part # is sometimes on a tag, soldered to the upper tank, sounds like it is missing

the only 22" 1967 b-body big block radiator listed in GG's "white book" is 2785960 = 22" 383 2bbl

you could research the above number and compare to your radiator or post pics & someone may have an idea what its original use was