1973-87 truck ralley wheels,?

[E.Furgal]

I am going to be using a set on my 71 c-10
I had them powercoated,, (THANKS DAD)
4 are 8" wide 2 are iirc 7
I bought black chrome gorrilla lug nuts.. and I plan on pin stripe'n the rim lip to match the truck color..
the center caps I have are off a van and a set off a cop b body..
they are cast metal and chromed.. and pitted, but that fine..
the screws that hold the caps to the wheels are standard steel, and rust..
anyone know of a place that sells either chrome plated or s/s ones..
was looking at s/s but have no clue on what to call the thread type and size

thanks for any help..