the tank is advertised as 17 gallon , fits pretty well and does not hang down very far. I had the aluminum angle for the brackets welded on locally. I cut out the AN-8 fittings and made some tapped aluminum blocks with MIP thread that welded inside the tank and so I could use fighter radius fittings. The AN -8 90* would not clear the bottom of the bed.I moved the pick-up tube to the passenger side of the tank. Thought if you ran out of gas and pulled off the road the gas would run to that side .
I welded heavy 4" channel across the back of the frame and braced it well . If you get rear ended I wanted some strength around that tank. Still better there than in the cab! I welded angle tabs out for the bed mounts. the original mount holes are now in-accessible. the bottom of the bed rail has holes for outside the frame anyway. ran all new electrical wiring for lights and tank sender added a spare wire for future back up lights and maybe a trailer plug. ran a frame ground too
Now I can build the filler neck and turn it out over the frame rail. and to a fill door cut in the side of the bed like Alan is doing in his thread