I don't recall seeing any 1923 ARA cars from RC. In fact there is now on e-bay a listing for an RC "X-29" lettered for CGW. It even has the reversed 3 panels on the door and is numbered 86302. It looks like  a reasonable stand-in for the correct car, but it IS an X29 style with X29 rivet pattern and ladder position. Would RC produce a "bogus" 86302 if they had a 1923 ARA car available?