Jimbo. Here you go. The 3600 trucks had a plate bolted to the inside of the frame, but this is the bracket they use. Same as the front.

http://www.lmctruck.com/icatalog/ca/full.aspx?Page=90


1954 3600 Chevy Truck
"The Fake Truck"
In the Stovebolt Gallery
More pix on Photobucket