Riveted the reinforcing rings and platenuts in place. I used the band saw to cut the rings so I could slide them inside the tank.
Since the left tank had had the fuel level gauge installed in the back baffle, I had to use the original sealing plate (not used on the left side because of the flop tube) to mount the level sender. I had to order new hardware to block off the hole and put a couple rivets in to seal everything.