FAT BOB STYLE GAS TANK. This solid mount Fat Bob style gas tank has the screw-in style gas cap opening. Raw Steel 5 Gallon screw-in cap style gas tank set Approximate width 8, use screw-in cap &. Fuel valve Fits FXST & FLST Softail 5 speed frames 1984 THRU 1999. To Lower 48 States USA.Be sure to add me to your. FXST FXSTC FLST FLSTC FLSTF FLSTS BAD BOY FXSTSB FLSTN SPECIAL NOSTALGIA. The item "5 GALLON GAS FUEL TANK HARLEY SOFTAIL FXST FXSTC HERITAGE FAT BOY SPRINGER 84-99" is in sale since Wednesday, December 24, 2014. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle Parts\Body & Frame\Gas Tanks". The seller is "crowescustomcycles" and is located in Battle Creek, Michigan. This item can be shipped worldwide.