So several failed times on ebay and free parts on here I've missed out on clocks/thermometers for our control panel as ours were long gone. I started noticing these weather monitors for walls that had the thermometer etc but no clock. The veterans probably already know of the site, but Clock Parts - The World Leader in Clock Parts
sells great "fitups" or preassembled clocks, thermometers, etc in various sizes colors etc. Units range from 5-15 bucks for typical sizes I've seen in airstreams. Shortland-Bowen
is the brand name (just put it in their search field) of the 2 3/4 that I ordered that fit real well with just slight filing of the opening. Quality is great and they are very accurate so far. Model #'s I used were W73GIA clock and W73GTI for the thermometer. also have lots of movements for rebuilding old clocks if your housing is still intact. Only downside I saw was a $20 minimum order before shipping.