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My Vista Cruiser, third row, seat-belt bolts were not chrome.
The only chrome bolts in my car are the visible ones on the second-row seat belts. These have a stepped shank to allow the belt retainer to rotate when the bolt is tight. You can see one of these bolts in the lower right of the picture.
My Vista was assembled first week of 1970 but I don't think that makes a difference.