Source for Hardware Kit/Fastener Set?

[DallasMalibu]

Currently starting my first square body build ('78 C10 stepside "first car" with my son).

I've had a couple old Chevelles and it was easy to find hardware kits that includes all the correct body/interior nuts/bolts/fasteners. Is there anyone making anything like this for our C10? Maybe I've been spoiled?

I came across a stainless kit that is very pricey (here), and one kit for front fenders on ebay, but not much else.

Where do you guys get your hardware? Thanks!