Ed, If you look at the colored brochure pix I attached in my first contribution to this tread you will note that the large trucks front bumpers do not have a dip in the middle like your truck has. It would appear that the front bumper I have, it has the attachment bars bolted to the bumper, is the one you need.
I have attached a couple pix of 38-39 Crew cab truck I found in northern CA several years ago. Tried to buy it, the owner would not sell it, I saw the truck on ebay a few years ago. Wm.

Attachments
39 GMC.Ca-05.JPG (256.34 KB, 248 downloads)
39-40 GMC.JPG (244.12 KB, 247 downloads)


1964 C10 with Railroad cab
60-66 Forum
1940 Chevy G506 4x4
Big Bolts
1937 GMC T14
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