fender flares?

[Fleeingpepper]

Well I'm just changing one fender-stupid asian lady-so I can just stick a rod in on the side I'm replacing. But even if I replaced both fenders it would probably still be easier to just do them one at a time so only one side of the hood is being supported.

 

[Sandman]

The Cab Corners aren't that much to replace. ($45)
http://www.latemodelrestoration.com/products/Chevy-GMC-Truck-Cab-Corners

You should do almost a full replacement on the wheel well. Don't screw around with the partial replacement. Here are some ($85):
http://www.latemodelrestoration.com/products/Chevy-GMC-Truck-Rear-Wheel-Arch-And-Wheel-House-Panels

With the front fenders, you have some choice. You can get OE replacement for $317 or Non Capa for $110. But with the fender damage you already have, I would recommend getting new fenders.
http://www.latemodelrestoration.com/products/Chevy-GMC-Truck-Front-Fenders

With the rear full wheel arch, do you know how those are replaced? is welding involved or are they just bolt on?

 

[96k1500]

the rear full wheel arch are cut out and weld in replacements