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These ARP derby cover bolts are milled to specifically fit OEM derby covers and aftermarket derby's that were not provisioned to use ARP bolts. Pick your bike to ensure you receive the correct length for your application. Unlike others, These are actually made in house, to OUR exact specifications. On OUR machines. These are only available in stainless because black oxide will rust. “Flange” diameter is 0.365” +/- 0.0005”

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