Here's a proposed overall line-up (minus trucks).
It provides zero overlap between Mercury & Lincoln.
FWD/AWD: Ford Mercury Lincoln wlb ovl
B F2/crossover - - 95-100 160-170
C1 Focus/crossover M3 4d dual*/2d cc - 103+ 175
CD3 Fusion/Fairlane Milan*/wagon LZc(2d zephyr coupe/cc)/xuv 108- 185
D2 500/Freestyle Montego(*?)/wagon LTc(2d towncoupe/cc)/xuv 112+ 195
D3(v8) 500Galaxie - LTs(4d townsedan)/xuv? 116 205
RWD:
swb- - - 2seat-cc 89-100 180
swb Mustang - - 107 187
swb+ Falcon '4'd Cougar 2d dual*/cc - 110 190
lwb- Thunderbird '4'd M-CLS 4d* Mark-X (2d coupe/cc) 115 195-200
lwb CV#(taxicop) Marquis - 117.5 206
lwb+ - - Mark-Xs (4d sedan) 120 209
lwb++ - - Continental (xl '4'd sedan) 122.5 212
* dual= sedan-hatch: sedan look with dual rear opening, full-hatch + small trunk panel
# CV = CommericalVehicle no retail version
cc = coupe-cabrio hardtop convertible
'4'd = suicide rear doors (RX8/Conti'60s-style)
2seat-cc Lincoln = Miata/RX7 OR Mustang based (v6,v8s,v10)
Mark's & Continental share styling and as many body panels as possible (v8s, Continental=v10)
back to 1st rant

Mercury 'M4'