I am going off the info for my 3800, but the last 7" should only be concerned with bolt holes for the bumper brackets and the rear bed sill. I also had a one ton panel truck that had a frame extension on a 3600 frame for the proper length. I gathered from this that not all holes were for just one application. Also from my own truck, there are a few extraneous holes that a PO may have supplied. That didn't stop me from putting on a bumper.


Dave Baird
1951 Chevy 3803

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