John,
You are correct. That channel is supposed to extend down to contain the soft channel for your glass. Kent is also correct about the original soft channel, however, as a practical matter, a one piece, soft channel from lower front to lower back is an excellent option. I like the channel without the chrome bead. It looks better and is MUCH easier to work with. Mine stuffed in so snug that I did not fasten it in place.
I think I have a pair of NOS running boards for your truck. I will check this afternoon.
I have a 1936 Low Roof 1-1/2 ton...look at it here, if you want. https://vccachat.org/ubbthreads.php...w-roof-semi-lots-of-pics.html#Post216672
I also am about to start a 1938 Suburban project.

Mike Russell
Columbia, MO

1936 1-1/2 Ton (RD) Stake Body Original
In the Gallery Forum