I am about to freshen up my grille and core support. I believe the core support is semi-gloss. Could someone verify the argent color on the grille and the black on the core support?

 

I did Krylon spray bomb dull aluminum or fake chrome on all the silver on the nose when I fully restored the car in 1990. Can't remember exactly which. I will note that within a year, the silver weathered to a really nice OEM look. Same for the trunk lip chrome. A few gentle washings and some limited sun at cruises and shows, it still looks great and has not changed appearance.
The grill was a new Year One (YO) unit back in about 1988. The black is a semi-gloss.
The spray bomb silver was matched to the YO grill. Both patina'd together well.
The core support got a semi-gloss rustoleuim.

 

Thanks for the info. You did a great job on that, and it's held up well.