Re: Rocker Replacement
I always make a reference mark on the front and rear door pillars, and measure to the center of the holes, and to the bottom of the inner and outer rocker panels before I cut out any rust. Refer back to these measurements when you tack the new parts in place and test fit your door before welding everything up.
I also traced the holes on a piece of thin cardboard so they would have the same spacing as the factory. You can also find the measurements in a 1967-72 Chevy truck assembly manual.
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