[SCOTI]

Paint those calipers black to match the fronts since you did good on them.

ECE has the rear most c.member for a decent price w/the holes already punched. I couldn't find the right sized c-channel @ my local place & ordering from an unknown to save a buck or 2 didn't seem worth when I knew the ECE piece would fit w/o issue. Might be worth looking into.

The Panhard bar c.member should prob be left in place as it braces that area of frame specifically for the Panhard bar. There should be enough room to get a decent size tank back there when you move the rear-most c.member all the way back.

My buddy will prob come out to the shop tomorrow night (if it's not snowing here too) & I'll finally get those dimensions for you.