[Fordors]

Dimensions from a really accurate drawing show 40" rear and 23 5/8" front, outside measurement. The frame material is 11 gage (.119) and both front and rear spacers are also 11 ga. Rounding up the .238/side to 1/4" will give an inside measurement of 39 1/2" R. and 23 1/8" F. I don't have a factory front bar but an aftermarket stainless bar measures 23 3/16", very close to the 23 1/8" dimension needing a minimal spread of the horns to fit. A factory spare tire bar checks at 39 5/8" so the rear of the frame needs a slight 1/8" spread for the bar to fit. An aftermarket stainless bar I have is only 39 3/8", 1/8" less so the frame horns will be pulled in slightly if no spacers are used. One other thing, my original used and abused but very nice frame is 23 1/2" outside, at the front horns but who knows what happened in the last eight decades. The rear horns had been cut off and replaced at some point so I did not bother to measure that width.