https://www.stovebolt.com/ubbthread...43/re-body-plate-decode.html#Post1135643Ed,
"Word is that non-standard stamps and non-standard rivets(not pop rivets) were used by factory, I would be very careful how you handle this, especially in the Land of Fruits and Nuts . . "
Not just in the western land of fruit and nuts. Some states, and/or some offices in some states are very careful.
I my local NC DMV, a new ID plate or any old ID plate with new screws or "rivets" would fail a registration no matter what documentation or former registrations/titles you have in hand (I know). The way around this in many states is obtaining/requesting a bonded title (if allowed by that office/state - a judgement call). DMVs, quite properly, are very careful giving registrations to vehicles that might be stolen.'
Also, rivets were not used in all years.
http://www.oldchevytrucks.com/blog/index.php/2010/02/screw-on-id-plates/ 
