I've had good luck with fuel pumps from these guys, real reasonable pricing. https://www.highflowfuel.com/p-2965-home.html
Britt, I wish I had more to report, but it's not going to happen this year. I do thank you for all your advice, just not enough skill for a couple of hobbyists using a less than ideal tig welder. I haven't given up hope yet though. I took an old 2005 tank I had and started to modify it to fit the 2015. The best part is that it is steel and I can work with steel. It will take some serious mods to make it work, but that tank cost me $50 5 years ago, so if it doesn't work, it will go in the trash. We will only race the endurance round at Pitt-Race this year. If we have to use the stock tank, so be it. It will be fun as hell regardless of the equipment!