Does anyone know if these long bolts that hold the grill together are to be clear zinc, yellow zinc, or painted black?

The bolt head and the nut will be the same finish as the grill, the shaft is concealed so it does not matter.

When the hood is open, I believe you see the shaft inside the vertical supports.  I'm trying to decide if these get plated with the rest of my bolts or painted with DTM epoxy primer.

I’ve always seen the same color on the grill no matter where I look so I assume the grills were painted everywhere in the same gray. Never seen any hint of old plating on those long bolts.