Thank you everyone for the replies! Yes... the '65 is an anomaly. My existing housings are various shades of gray due to the various tapes holding them together. I have an earlier version of the VTS housing and it is white. I have asked VTS the same question, here is their response:
"We don't know for certain, but we speculate that it should be matte silver"
I also want a durable coating and have used Eastwood 2k Aluma-Blast which is a two component paint in a single spray can that looks like cast aluminum (i.e., matte silver)
https://www.eastwood.com/eastwood-2k...uma-blast.html