TJMOTO Custom 4.5 Gallon Regular Gas Fuel Tank For Harley Davidson Chopper Baggers Bobber Custom Chopper Tank for Custom Harley-Davidson Choppers and any Custom application. Gas Tank. 4.5 gallon capacity. 22" Tunnel width 2-1/2" Overall length 22" Width 15.5" Height 9.5" Tunnel Depth 2". Come with pop-up gas cap. US Seller! US shipments.