Thanks a lot Dan, now you got my brain trying to work
I have no record of a RPO B22 for 69 Chevelle, but that doesn't mean it did not exist.
If my memory serves me right there were a couple of threads on TC about this code, but it was for 1970 cars. I believe it had something to do with the SS emblem on the door panels. That's strange if you relate that to 69 300 Deluxe SS models as they simply said Chevelle on the door panels. If I find anything I'll let you know.