Paint Color below the valance panel

[72bbblu]

I've got a low mileage mostly original C10 that has had a re-spray at some point. I'm working on getting it back on the road and doing paint/body right now. I've been searching quite a bit both on this forum and just regular image searches from my browser trying to see what color folks have under the louvers in the valance panel between the back of the hood and the windshield.

Mine is currently light blue (truck codes are light blue/white). I don't know if it ended up light blue from the re-spray or if that is factory. I've seen two pictures of nicely done trucks where it looks like black through the louvers and then I've seen more with body color. My question is...how did it come from the factory?

I'm leaning towards the light blue because I feel it won't be so obvious, but if black is correct, then I may go with that.

Thoughts? Thanks!