I've got this huge gas tank that came out of my Blazer and it's for sale. It is made and attached like the aux tanks on pickups. It had 4 long carrage bolts going through the bed of the truck and had the 'nut assembles' like the aux tanks have. If you want to see one like it take a look at Brotherstrucks.com They show one coming out of a Blazer. No leaks when it was in the truck. Don't know if the sending unit works or not. I had to cut the bolts to get it out so they aren't included.
I'll take 50 bucks for it. You figure out how to ship it. It's heavy.
Here's the link to brothers if you would like to look at one.
http://www.brotherstrucks.com/tech/t...ATION+&index=0