Carburated:Tanks fit between the frame rails, are fully baffled and compatible with EFI or carbureted applications. Suburban tanks are designed to fill in the original location and all other tanks are available in a bed fill standard (-BS), which is accessible through a fuel fill door, in a bed fill flush (-BF), which is accessible through a flush mount cap and in a side fill (-S). These tanks are made from .125" 5051 aluminum and have a .187" mounting bracket. It's the thickest and strongest in the industry! #5559AGT is notched for leaf spring clearance and will NOT work on 1958-59 Fleetsides. Sending units sold separately. Note: Gas tanks ship O/S; additional freight charges apply. Also, 1947-54 tanks will not work on 3/4 ton. Fuel Injected tanks include in tank pumps. See chart at on second photo to choose the right tank.