They are reproductions of the original Eaton gas caps

interference threaded studs

Essential installation notes:

rotating a full 360 degrees

Stainless Steel Solo Seat Hinge / Pivot Bracket - Weld-On Fork Tube Diameter_39MM They are reproductions of theThe Lowbrow Customs Solo Seat Pivot is made right here in Cleveland, Ohio. Heavy duty stainless steel that is tumbled for a beautiful finish paired with custom made, chrome plated mounting hardware and a raw, mild steel, weld on pivot block that is coped for a 1. 25 inch diameter frame backbone. You can easily open up the radius of the pivot block with your grinder to fit other diameter frame backbones, or cut if off flat if welding to a flat mounting