I have also bought the 38 gallon and found the same exact issue. New bolts where too short! Had to go to ace and buy longer ones. I had no skid plate mine was held in by 2 very think pieces of steel that span across the bottom of the tank. I'll post pics later if I have time.
Anyways my install went ok. Hardest part for me was the filler neck. I wouldn't call it pug and play myself. It's all easy enough but it requires cutting the pick up tube in half and soldering a piece of copper tube in the middle as well as extending the level sender wires. MAKE SURE YOU GET THE SOLDER 100% air tight. If you don't you'll suck air. I sucked on mine with my finger over the end and made sure it held suction for a minute. Kinda nasty but better than pulling the tank later on.
Well I said plug and play, looking back on it from over 2yrs ago, it was a piece of cake. Yeah I had some hoops to jump through to work through some problems.
I decided to pull the bed instead of trying to do it all from under the truck. That was the first hoop, the bed bolts were rusted. Didn`t want to torch them as there are plastic fuel lines and wires on the L/F corner.
Looked like carriage bolts so ground off the heads thinking they would drop down and out as i lifted the bed. Well not exactly, but was able to lift the be a few inches and torched off the bolts between bed and frame.
I use my Cherry Picker and HF Ratchet straps to lift it. 2 connected to the corners diagonally wouldn`t lift it till I added a 3rd connected under the wheel arches and then it lifted.
(NOTE: before some one jumps on me, you will have to unplug electrical and disconnect the 2 fill tubes)
Drive the truck forward and set bed on saw horses.
And then you will have full access to everything.
The sending units, I used compression fittings to attach the copper tubing to extend the suction tube.
Installed new Shower Heads, and the Float arm, cut it and add about 5 1/2 inches to it. Went to a hot rod shop and they brazed it together. You will have to tweek the arm a bit to get the gauge some what accurate. I had 20 gallons of fuel, and added 5 at a time to see where it read etc....
With the bed off my OCD took over I had to clean scrub and paint etc...
When I replaced the bed, the HF Straps made me nervous, so bought one of these bed lifters.
I as thinking safety, more than cost.
https://www.jbtools.com/steck-35885...Je5gT68R6XXI84eDuiJ-NWQNincFDUKBoCq_sQAvD_BwE
When backing under the bed, place a piece of card board or moving blanket (What I used) between cab and bed. Did`t want to damage the rust.
I searched every where for factory bed bolts, NLA from Ford. LMC has them If you have deep pockets, so went with the Hard ware store bolts. Cut 6 pieces of mud flap to put between bed and frame and bolts.
LMC has come down in price from a couple years ago. one of the bolts was $24.95
https://www.lmctruck.com/1980-96-ford/bed-tailgate/fd-1980-96-styleside-bed-mounting
So yeah looking back on it, wasn`t all that bad, but we are working on 30yr old trucks.
Soon as I get my $100K shop built, Iam buying one of these to work on my $500 truck.
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Have fun...
Goat