I've never seen that HVAC control unit before........Was that used in anything else? (I was thinking maybe the Celebrity, but.....nope.)
If it's an X-11, shouldn't it SAY "X-11" on the sides? We've seen an X-11 recently on this site, and it had the X-11 decals on each side. Here's from the 1985 Chevrolet Citation II brochure (yes, apparently this car is actually a "Citation II," not a Citation as all '85 Citations were "Citation II"). Front page of the Citation II brochure: