New to site: rebuilding a 53 chevy half ton

[mk_kbk]

Hi:
I'm working over a '53 chevy that has been in the family. To my surprise, everything works; engine (great compression), tranny, guages, etc. Pulled the bed out to replace and will be doing body work. The original color was the stock juniper green. I want to get back to the original look, will add no chrome but am wondering if I can get away with a different color as 10 were offered at the time under the title RPO 234. Anybody know what "RPO" means and what it took to get a different color in '53??