It turns out the tank i had no matter what could not be re-certified. It was old, rusty and on the inside had some rust. So i found two local tanks on craigslist that fit the description. Made in 1998′ there were a few differences. Notably the fact the propane valve is 90* upward versus a 45* downward angle. The feet were also different and didn’t lock into place like the original tank (both Manchester).
I routed out the lower piece of wood and added another piece of plywood that was fiber-glassed underneath. This way i could install the tank, bolt is down and give more headroom for the new tank. The new tank really closely interfered with the lines running to the stove and furnace so this gave more room. I also had to get 90* brass fittings for the 1/4 inlet and 3/8 outlet of the regulator. Once that was done, everything fits. Ill have to go in later and make it more waterproof in the box. The piece of wood under the propane tank was glassed, and coated with rubber undercoating to prevent future wood root since its right in the wheel well.