You are buying a Porsche 912 1969 Pierburg emission vacuum unit and coil relay complete with factory wiring harness. It consists of the Pierburg vacumm unit part number 901.113.309.00, the support bracket number 616.113.306.00, the relay box 0.336.611.004 Bosch 12V/17.5/4, ZK 9709, the Porsche part number for the relay is 902.615.113.00. Part number for the wiring harness is 902.612.087.01 (harness number 55 vacuum unit exhaust emission control). It is in very good, original condition as can be seen in the photos. 

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TBMS part # 9A011