Questions about new 1967 gmc 1 ton bed

[Martino patina]

Hello everyone I'm new so I hope I'm posting in the correct area. I bought a gmc 1 ton 1967 9 ft bed with dealer installed low profile utility tool boxes and I want to rebuild the bed. The question I ran into is my bed angle rails that run front to back on the bed sides they appear to be original to the truck but they are 1/8th thick 2 inch by 2 inch angle iron and I can't find any pictures of a similar bed they all have the fancy bent 18 guage stainless or painted side angle strips. Is this original price has it beenessed with I want to know what to put back to make factory correct