Lol an LTD II front end would be HILARIOUS on a Fairmont wagon...It's not an LTD II, It's an LTD!!! That's a real pet peeve of mine.
The LTD II designation was only used on the 77-79 intermediates. The 83-86 Fox LTD was a botched downsizing effort to start the phasing out of the Panther platform, which was now christened "LTD Crown Victoria" in all forms, including base. The full size comeback of the mid 80s of course prolonged Panther production for another 25 years, so in effect the Fox LTD could be percieved as a small companion model to the big LTD (just as the 77-79 Torino based LTD II was a few years earlier), but the reality was the Fox was simply intended to displace the Panther as the new "downsized fullsized" car of the 80s, just as Chrysler and GM had been doing.