Parts (LMC vs. Classic Parts)

[rpmerf]

I get most of my parts from Rock Auto.
Suspension parts - Moog (Problem Solver, NOT R-Series) or ACDelco (Professional, NOT Advantage)
Brake parts, I typically go for Wagner, Raybestos, Bendix, or whatever well known brand.
Most if not all of the parts you listed should be on Rock Auto. NEVER buy from the economy section if you can help it. Might be able to compare part numbers between sites.
Of the vendors for these trucks, I've used Classic Parts mostly, but also GMC Pauls, Brothers Trucks. The Truck Shop is usually at shows. Don't know that I've used LMC lately.