When I bought our late 93 XJ6 I knew the demist vents weren’t operating.
After an estimate of 10hrs at 100+GST per hour plus parts I decided to fix myself and with some great help from this forum and the internet the vents are fixed and dash is mostly back in.
I learned that the late 93 vents are different to early 93 as the dash has a dip in the middle presumably due to the 2 sensors as the early 93 so one I took the replacement vents out only had 1 sensor.
The flaps are different as well as they have smaller diameter spindles on the late ones with a bush, although if you take the bush out the early flaps fit.
So flaps swapped with some silicone grease on the spindles and tested with a vac pump the dash is back in.
Parts cost from the wrecker $50 including a center vent and blend flap motor that I thought may come in handy at some point.
I noticed that the earlier dash is held in differently to the later one as well. Interesting to see all the changes.
I did find a new old stock left hand vent on ebay so I bought it as a spare.