Ferrari Part Number 13543421, STUD FOR AIR PUMP shown here as used in Ferrari 328 GTB/GTS (1988 -1989 inc. ABS brakes) Table 27 Gearbox - Differential Housing And Oil Pump. Location in Diagram: 58. Required Quantity: 2. This Ferrari part is used in more than one diagram. Click on the diagrams below to see alternative uses of this part: