Here is my long story with the PJ 5" stretch tank. I ordered it and got it within a reasonable time, 2 weeks. I installed it and fought with the pump ring and decided to use RTV instead of the fuel pump ring gasket. I was only able to get 3" of stretch with my 8.8. I was not happy.
I installed my old tank and Rokmen skid back in there and cut up my PJ tank and skid. I had it professionally welded back together and made a skid plate for it from the old one.
It was for sale that whole time, but I ended up reusing it because it was cheaper than a new Gen Right tank and it was here and free.
I moved the 4 rear holes down and welded tabs to the frame and the sides of the skid to act as the front mounts. It ended up better than I expected, with an easy 4" more I can stretch from where I am at now, which is 3" more than the 3" from when the PJ tank was in the first time.