I have been looking for an Early Bosch Voltage Regulator 901.603.206.01. - 14 volt 35A

Sierra madre collection and Stoddard both list but Porsche in the UK say thay are NLA.

I have tried a Bosch Dealer with the original Bosch Part Number I found on the Bosch Automotive Tradition Website which is 0 190 600 005.

According to my local dealer this number doesn't work.

Dose anyone know a Bosch Part Number that may be better?