James I am assuming you cut the tank out of the original spot and had one custom made to fit? I did get all the original drawings from hunter, I just could not bring myself to cut the glass and then have to attempt to match the gel coat. One of the issues with the stock tank was the size, and that is fills from the side, not the top. The result is you lose volume (my guess is at least a gallon) because you can't really ever fill it. The one I installed is a Ronco stock tank, 18 gallons. The head does pump slightly uphill, but works fine. I upsized the vent to 3/4 from 5/8 and the pump-out is 1 1/2 inch dip tube (so no fitting on the bottom of the tank to fail). Again was looking for someone with a better idea, but no joy. Fills from the top as well, so you get 18 usable gallons. Ronco was great to deal with, and put the fittings I wanted where I wanted them. From other postings, it may have been a better install had I had them make a custom tank. I glassed in some cleats - not on the pictures I posted - and just have not gotten to making my bulkheads yet. Need to get a sheet of teak ply - or may use marine and then cover with formica. I also had to cut the end corner of the bunk cushion. All things considered ,it works out pretty well. That bunk is about 9 feet long on the forward end where I had to cut, so no issue there. Hunter has learned their lesson with the aluminum tanks, but not soon enough for us older boat owners. It was the one issue I knew I had when I bought, from reading the forums. If I had to do it over again I might have gone with a vacu-flush system, but would have driven the cost up considerably. It is like doubling your holding tank size though. One of my dock mates has that style of system, and it is pretty impressive. It also allows you to use much longer runs from the head to the holding tank, without using excessive water for every flush.