boogs, on my fuel cell(10 gal aluminum) i reused the stock tank efi pump and all. i had to remove it from my stock tank, and cut out the threaded ring that is welded into the stock tank. i then measured and cut a hole in the fuel cell that would allow me to put the trheaded ring inside the tank, and lower the stock pump assembly into the holw with the flange sitting on the top, outside the tank. so basically, the stock flanges sandwich the fuel cell. my cell was also too shallow for the pump assembly, so i had to modify and bend it for the correct depth, in the back of the tank. confused yet?? lemme know if you gots questions. works great.........brad