So for purposes of creating a replica window sticker, a 5 in front of the RPO code, along with any ECL from a sample found on a real window sticker should do the trick.
You must be joking.
I have been doing '69 ECL research for years and probably add a few every month.
While there are some specific to certain performance options there are many permutations of others. For example Z22 Rally-Sport Equipment currently has 20. One would think Pace Cars would use the same one; no such luck-there are at least 4. A specific performance option may have different ECLs with different engines.
I would go on but when I yap about ECLs Kurt S' BP goes way up.
Nothing wrong with doing a window sticker "recreation" but be aware that for 1969 Camaro used 2 forms [early-late]; both are different than other Chevrolet lines. Prices changed [Z/28: $458.15/$473.95/$506.60/$522.40], options were added/deleted during the year. Some options were not available with unrelated others. You will never get ECLs correct.
And based on what is brewing in the hobby you better note it as a "repro".