don't be fooled by substandard knockoffs that are out on the market

they are 1 inch diameter with a 3/8 inch shaft for the spring to sit over

Tanks for carbureted models accept 22mm petcocks

For a step-by-step tech article on shortening a chain for your bobber or chopper

Primary Mount License Plate Bracket - 2004-Up Harley-Davidson Sportsters - Vertical or Horizontal Brand_Mooneyes don't be fooled by substandardThis has to be one of the cleanest license plate mounting solutions we have seen for a Sportster. This mounts off the primary using the stock hardware. Just install the steel bracket (applying loctite to the bolts when re installing) then attach the aluminum license plate bracket, either Vertical or Horizontal, with the supplied hardware. Super clean and tucked in. Made in Cleveland, Ohio USA. NOTE: Be sure to check your local laws regarding license