needing measurement space of rear fuel tank

[tphsmith]

I have a 72 swb , not at the house its at the body shop, kinda far to drive just to measure the space between frame rails and the rear frame brace (like the brace that the rear tail light wire harness mounts the rubber gromet).what I need to know and hopefully some one can measure this for me, Im needing to know how wide the rear frame is where the location of the spare tire goes. fhew this will get windy here. Im looking rfor the measurements between the frame rails side to side out side frame rail then inside frame rail. and the front to back open space from where the brace after the rearend, tha brace that is at a slight angle to the rear frame brace. Im need9ing this measurement for looking at relocating a gas tank in this spot