Ran across this on the web, and had not seen it before. It looks vaguely like a EXP/LN7 derivative, but with a bit cleaner styling. Probably would have made an unimpressive production car, but as an unabashed fan of open-air motoring, I gotta give this one a hell yeah!
“While most concept cars looked forward to the future, Mercury went backward in time with the bright yellow XM, a two-door concept which re-introduced the rumble seat, an open-air design from the 1930’s. Though basically a two-seat vehicle, the rear hatch could lift upward into the deck, and a rumble seat would emerge, transforming the car into a four-passenger vehicle, with the rear occupants receiving fresh air.”