Re: '56 GMC Project
what i did was brace the area above lower hinge pocket to other side of cab and replaced lower hinge pocket.(the cab can spred if you dont) then hung door to use as a jig. if the front cab mount is badly rusted the cab has probably sagged and needs to be jacked back up. my drivers side cab mount was still good and was able to measure from frame to cowl to reference bad side.
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