15 Degree Chassis Plate – Am. – 15 Degree Chassis Plate with American Spacing (2-7/8″ center to center on frame rails). This chassis plate comes with American spaced steel clamps and 5/16″ socket head cap screws and is intended to be used in combination with our 542 adaptor plate or jackshaft kit (not included). For a complete mount kit, please see our 4-cycle mount kit section.