Dear ponmarcn,
actually, there are not too many red tones to choose from. There was only "Claret Red Poly" which is a Burgundy dark red and "Seminole Red" a very flashy color.
Also look here: http://www.agentbudd.com/56Buick/index2.html
...under "1956 Research" and "Paint Chips".
You may find original paint chips on ebay once and a while. I bought a set too, but the guy who did the "Tahiti Coral" paintjob on my car here in Germany did not need it, as he was able to still buy this color directly from the original manufacturer... You will find the respective order codes on the above link, too.
Good luck
Maikl
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