Rugo
GMC used a Gold Bronze pin stripe as well with their Narva Green body color. I am not sure if it is exactly the same color as Chevy used on their trucks. I had an opportunity to photograph an original paint, unrestored GMC truck that had the original pin stripe. (Unlike Chevrolet, GMC did not stripe the wheels.)
49 original paint As you can see, it is not a metallic paint.
In doing research I found that 1 Shot Lettering Enamel in 191-L Imitation Gold
Imitation Gold came very close to matching the Gold Bronze used on the GMC trucks.
I had an old pin stripe guy do the stripe on my 52 GMC who was very familiar with the color stripes used on these trucks. He mixed up his own version of this Gold Bronze color but it is very close to 1 Shot's 191-L.
52 GMC stripe If you are going to have someone hand paint the stripes I think they are probably going to want to do do it in these lettering enamels as they can be easily wiped off if they make a mistake. I hopes this helps.
Mike