Gas Cap for built-in tank bike frame

Do you have a SkyHawk built in tank bike frame?    If you do here's the gas cap that fits it.   

These caps are hard to find so we decided to add them in our product line as an accessory item.   It is an EPA certified cap with ventilation and a long lanyard to prevent loss.   

Price is only 2 dollars but we can't stay in business selling and shipping 2 dollar items.   Therefore; we have a high shipping weight that allows you to order more items and use up the 20 dollar 11 lb shipping wt. cost.    Just stay under 11 lbs total weight for the 20 dollar shipping cost.