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Ferrari Part Number 100120, 2ND UNDERSIZE 0.508 MM. ON ? shown here as used in Ferrari 308 GTB (Fiberglass 1976) Table 3 Crankshaft - Connecting Rods And Pistons. Location in Diagram: 3. 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: