Update:I've reached out to Buick via social media with all the info about RPO codes asking why this wasn't included with my vehicle and when can I expect to receive it.
I'll post an update when I hear more.
First response from Buick: Yes, the RPO codes do show those parts. Go ask your preferred dealer and they will help you.
My response: The dealer has no idea what these parts are, so please provide me with further information about them and how you can get them to me.