I decided on a tank from Tanks Inc (see my project journal for more information).
It fit into the frame without modificantions to either the rear frame cross member or the angle cross bracket near the rear of the differential.
The fill will be on the passenger side, through the rear fender but I have not decided on the exact type of filler yet. Several members have provided options they have used that I will be reviewing.
The tank is narrow enough that I should be able to run dual exhaust out the back without any significant problems.
