For those who have stock rear bumpers on their 1/2 ton '54 or '55 1st series, can you tell me the distance from the lower edge of the rear pan/bed support to the lower edge of the rear bumper? Maybe this is the same for the pre-'54 trucks. I need this info because I am trying to run my dual exhaust but I don't have my rear bumper yet. I don't want to have clearance problems and I don't want to run the tailpipes any lower than I have to. Thanks in advance.