Sooner, try this it may help get you on the right track.
http://www.oldchevytrucks.biz/34_46/full.asp?page=0019This link it for the truck but you may find them for panel as well. I just finished making my mounting blocks for my 52 Panel and they are wood. On mine there is also a rubber pad that goes on the bottom between the wood body mount block and the chassis.
I also would suggest going to the forum (bed forum) where Mar-K is listed as they sell bed/wood kits. You may find something of value there.
Good luck and perhaps someone working on your model will come along shortly.
