If you can live with less tankage and want more room, or can swing different configurations....
I put in 2 -58 gallon plastic tanks and coukdnt be happier. Made a lot more storage room in the ER.
I still get 300NM between fillups if I want. I am never suprised at fuel level and burn rate, I burn through tanks fast enough my fuel remains pristine, I can fill right to tge top at refueling because I can see the fuel level so actually more than 100 percent capacity is pissible without rfear of venting fuel, and they are light enough when empty to pull out and inspect or alter if necessary.
Cost for 2 plus shipping was about $650.... 5 years and 4, 1200 to 1500 mile round trips to Fl ago.