1959 Fleetside Deluxe bedside trim (shortbed)

[Grape Ap(ach)e]

Well gang, I finally have a set of this trim on the way. It's been a year of searching.

For those who have it, what type of fasters hold it on?
My understanding is the end pieces screw/bolt on and then the stainless strips go over the exposed screw heads.

But how do the stainless strips attach? Clips? Studs and nuts?

For anyone who had to drill the holes, what did you use for a template?

Thanks!
Grape