I put a wagaero tank in a 12 about 10 years ago, it's still going strong last i heard. Be advised they are only 18 gallons now days. Be sure to pressure test it while it's out. I did hear they were back ordered during the pestilence.
I attempted to buy the Wag tanks, and they strung me along for months. It was a good thing for me I started tryin to get tanks long before I needed them. In the end I went with the 24 gallon Dakota tanks. It’s more expensive and mor work but we’ll worth it. Better craftsmanship and I was thankful for the extra fuel in Idaho this past
June. Also trying to get Wag to put a forward fuel port in was near impossible.
Just for an FYI for those wanting the -18 sight gauge fitting put in new Wag Aero tanks, FA Dodge has put many in before for those want it. Not bad if your in Alaska, if not, not sure if the shipping both ways would be worth it to you.