Does anyone make a replacement tank for the h3?

 

Sorry, you're on your own there. Nobody makes an aftermarket tank for the H3. You'll have to find a suitable tank/sender/etc and find a place to mount it or custom fab something unless you like carrying jerry cans around to splash fuel in when you need to get back to the roads.

 

you could always run a keg of gas from the cargo area in the gas tank LOL