Adam, i'm pretty sure the HZ brochure car is actually a HX.

I think RUB being on the build sheet is if they put STD there may have been confusion as to what was standard. Maybe it was in response to prior stuff ups? The carpet issue is a perplexing one. I haven't 100% figured it out from the ordering procedures and features manuals, and this may explain why ie confusion so RUB was used. Kingswood is the most confusing, especially HJ.

Yes HJ Sandman did have an upgraded interior over HQ. D14 armrests became part of the XX7/XU3 package later on, but there is no mention of them in the release documentation (including the options list), but I do not have the HJ release features manual page I need - this is another thing I need to finalise on HJ. Carpet also became standard with bucket seats (although this is still confusing in Kingswood). So i'd say the HQ you had was optioned but the HJ's were all standard.