I certainly have no idea, and would be really interested in seeing those numbers. I've thought about getting a Marti report for my car, but that would only tell for '79 Zephyrs.
My car and the yellow Fairmont above both say "ES" on the bucktag. From what I can tell, that's the only official indicator. Here's the decode of my VIN, door tag, buck tag:
VIN
9 = 1979 model year
X = St. Thomas Assembly
31 = Zephyr 2-dr sedan
T = 3.3L I6 engine
604668 = 4,668th 1979 Mercury scheduled for production at St. Thomas Assembly
Door Tag
Date - 09-78 = September 1978 scheduled build date
F0047 = 47 lbs front accessory reserve load
R0081 = 81 lbs rear accessory reserve load
Exterior Paint Colors - 1G = Silver Metallic
DSO - 46 = Twin Cities district sales office
Body - 66D = Zephyr 2-dr sedan
VR - [blank] = no vinyl roof
Int Trim - VA = vinyl seating, low-back front buckets (V), Black interior color (A)
A/C - A = manual air conditioner
R - [blank] = no radio
S - [blank] = no sunroof
Ax - 8 = 2.73:1 axle ratio, non-locking differential
Tr - W = C4 automatic transmission
PP = front springs
AA = rear springs
Door Tag
0716 = rotations #0716
Z2DR = Zephyr 2-dr sedan
46 = Twin Cities district sales office
31
T604668 = last seven of VIN (decoded above)
WL = window louver (?)
FL2
BG = bumper group (?)
BK = Black interior (?)
AC = manual air conditioner
M2
ES = ES model/trim level (?)
1G = Silver Metallic exterior paint color
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