Performance Online (POL) expanded theclassic truck product line by offering the 1st rear mount aluminum fuel tank for 1973-87 Chevy C10, GMC C15 and C20 trucks. These tanks are designed to fit between the frame rail and rearward of the axle. By eliminating the hazardous side saddle tank, you get cleaner body lines and added safety. Made of heavy gauge aluminum, these tanks offer a light weight design and are fully baffled. Works on 4wd applications.