Info needed: Chevrolet timber tray brackets

[Tony Smith]

I have a poor condition tray and sides, but can't say with any certainty if it is Ford or Chev. There are quite a few of the hoops missing.

The frame brackets consist of 3 pieces; 1 flat plate on the inner side of the timber, 1 flat on the outside, then the frame hoop on the outside of that, all sandwiched together through the timber with 5/16" Whitworth square bolts and nuts. The flat plates are 1/4" thick and 4"x 1 1/4". The hoop shaped plate is 3/16" thick and the same external dimensions. The hoop opening is 1" dia. The bolts holding it all together are 3 3/16" apart.