Friends, after some pretty extensive research, I finally found this original part number. This is correct for the 1969 through 73 Jaguar J6 and XJ 12 models fitted with the model 16W wiper motor part number 75721. What made the search difficult difficult, was the fact that Lucas superseded the original part number 75639, to the new part number 75721. If Lucas had made researching these obscure parts easy, it would be a miracle.