'58 Redwood Copper Poly was code U, Ditzler DDL-21516, Dupont 2687L / 882-90397L.
It is a 1-yr, 1-Division color ['58 Pontiac ONLY].
Paintref.com is a great site :
https://paintref.com/cgi-bin/colorco...r=1958&rows=50
Congrats on owning a '58 B - have always liked. Hardtop or droptop?