Ferrari Part Number 13543421, STUD FOR AIR PUMP shown here as used in Ferrari 328 GTB/GTS (1988 -1989 inc. ABS brakes) Table 34 Clutch Hydraulic System (For Car With Antiskid System). Location in Diagram: 19. Required Quantity: 4. This Ferrari part is used in more than one diagram. Click on the diagrams below to see alternative uses of this part: