Leo's method would be better with the plates behind the sheet metal. I did a similar thing on my 3100 using a kit from one of the seat belt vendors made specifically for AD trucks. The headliner has to be out to get the reinforcing plates behind the sheet metal.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.