Any of the board vendors (GMCpauls, Brothers, Ecklers, LMC, Classic Industries, etc.) will have the varous cab, core support and bed mounting bushings and bolts.
For the hood hinges you can certainly get stock replacments at the above mentioned purveyors or if you want something more "custom" there are a couple options.
Cowl mounted, gas spring, super trick, high quality, a must for layed out rides, hinges are available from the world famous Nate Porter @ Porterbuilt
http://www.porterbuiltfabrication.co...tarting-at-265
Original style scissor action but made from billet aluminum with gas springs instead of coil springs are available from Eddie Motorsport.
http://www.eddiemotorsports.com/stor...&p=26932&c=395