This makes me fearful to order a new RT... having it show up without a key feature for me and having no path to get it installed. Is there language in the order you got that stated components/features could be removed due to availability?
If it's anything like previous orders, you want to approve the
detailed option code+P/N version of the order form to make sure that the ACC P/N is on there (e.g., OPTION 201 includes P/N A, P/N B, etc). If you order something and they can't provide it or build it for some reason, typically it just gets delayed to the point where it never gets built.
Check with your dealer what they can do for you and what's the current policy.