I have seen this thread go on too long. There are no technical differences
(only superstition) between the generic Bosch 3 wire part and the 3 wire unit
with the specific VW connector. There can be significant differences in the
quality of contacts made when splicing the generic unit to the VW connector.
The wires have a different alloy composition than the traditional copper or
tinned copper wiring used in the harness, or for hobbyist electronics. This
is a high temperature alloy, chosen to minimize embrittlement at the high
temperatures seen in the exhaust circuit. There are several other ways to
damage this system all of which I have addressed in the archives long ago. I
also offered a suggestion as to how to make an adapter to splice between the
VW harness and the Ford Mustang connector on the generic Bosch unit.

Frank Grunthaner