Blower Motor Nuts

[440ehigh]

I'm trying to figure out the original finish that my NON AC blower motor fire wall side nuts were originally. I know the MMC book says silver cad or phosphate finish.

I've seen a couple pictures lately with cars blower nuts in yellow dichromate. In my google search it seems a lot of B body cars had yellow dichromate nuts

1st pic is highly restored hemi car the 2nd picture is mine.