The "Fairlane" roof is the Montego upper with the Torino lower.
At one time, Motor City Resin made it; Jeff said it took him about an hour to do the roof swap. IIRC, it was right after the Cyclone had been re-released by MK.
There was substantial embarassement at the Glass House in Deerburn when it was revealed the snazzy new body was functionally a parachute at speed.
Incredibly, even at the peak of Ford racing, the approved surface model did not spend a second in the wind tunnel. The Fairlane Club of America (FCA) website had the whole "who-shot-John" story, but I haven't seen it in a while.