Looks like you are just missing the nuts on two of the bolts. Also Most of the 'truck' vendors should have the parts to freshen up this mount and probably a diagram of how it goes together.
Best of luck

http://www.oldchevytrucks.com/cart/index.asp

Last edited by JiMerit Boltr#43; 01/26/2012 8:24 PM.
It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy
1953 Chevy 3/4-ton Factory Stakebed