The Stovebolt Site Forums The Shop Area Paint and Body Shop Doors Window Channel Bracket - 1947 3104

baldilocks - I believe the intent with the kit from Chev's of the 40's is to drill out the spot welds holding the original U-shaped channel standoff bracket from the outside front door edge face. Then mount the replacement bracket with screws into the J-nuts supplied for the brackets 4 corners through those same holes. Then you can attach the lower end of the new channel to that bracket with the other J-nuts and screws and upper end as originally designed.

The inside of door access port is definitely not big enough to get most drills and an operators hand in there to try and drill out the original welds between the U-bracket and lower channel piece.