The PO of my 1974 SL got a replacement pump from an E-bay supplier in the middle east (Dubai I think)
He said it was marked "made in japan".Was supposed to be a "copy" of the bosch unit.Maybe it was the datsun specified pump?
He was quoted about 700-800$ from a mercedes supplier and paid maybe 150$ for the japanese pump.It's still in place and working fine!