Rubber base for rectangular mirror. It fits 911 (1971-1975) and 912E (1976).
Porsche Part Number Variation 911-731-129-00 911.731.129.00 91173112900 911 731 129 00
Porsche Part Number Variation 911-731-129-00 911.731.129.00 91173112900 911 731 129 00