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Adapter by The Cyclery; for Rocker housings; fits Knucklehead 1938-1940; steel, parkerized; replaces OEM 177-38, and 17570-38; Germany; gross weight: 36 g

This adapter was used by the factory 1938-1940 and is required for all early type rockerboxes on the rear exhaust position to seal properly against the valve spring and rocker arm covers.

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