the reference page shows Arctic as being slightly more beige than the Riv White, but you have to be extremely careful with computer displays. you can shift apparent tints an amazing amount by playing with monitor settings.
https://www.teambuick.com/reference/...66/66paint.php
i'm also not sure how a metal flake paint would show up.
i would expect most automotive paint shops to have a cross reference to hand, although 50 years out is getting pretty old.
i know there were one or two 'old paint' specialists but i don't remember what they were and i don't seem to have them bookmarked.
if somebody else here can't give you a reference, check with either RivOwners.org or the AACA forums.
The way to crush the bourgeoisie is to grind them between the millstones of taxation and inflation.
Vladimir Lenin
Government schooling is about "the perfect organization of the hive."
H.H. Goddard, Human Efficiency (1920)
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