Original Bosch Alternator - IR/EF Series, 115A
Porsche part number: 964 603 156 01
Bosch part number: 0 120 468 125
Note the correct insulator used on the B+ and D+ terminals. It is longer in order to prevent the heavy eye lug that attaches to the B+ lug from shorting out against the alternator case should the insulation on the wiring chafe.