4 State Trucks carries replacement fuel tanks for your International 8600 TranStar including BestFit 80 gallon or 120 gallon rear fill fuel tanks with metric fittings on the pickup and return tubes and backed by a 2 year warranty from the date of purchase. We also offer a 45 gallon front fill auxiliary fuel tank kit by BestFit which includes J brackets, stainless steel straps, rubber strap liner, fuel cap and measures 19" x 36".