Ferrari Part Number 16104421, SELFLOCKING NUT shown here as used in Ferrari Testarossa (1988-1991) Table 51 Rear Suspension - Wishbones And Shock Absorbers (Until Car No. 75995). Location in Diagram: 8. 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: