3100 overall length =178.050 [WB = 114" CtoC of axles or mid points of spring hangers]
width of frame rails at rad mount brackets CtoC = 39.940, front width outside = 34 ... width at back CtoC = 31.759, and 33.719 outside
doesn't have the diagonals, but whatever measurement you get one diagonal should = the other or it's wracked .... prolly can be off up to an inch or so with no problem
find info about the factory resto pak
here