That door tag is from a 1988 GT 3-door sedan (hatchback), not an LX 2-door sedan (coupe/notchback)
VIN
1FA = Ford vehicle manufactured in USA
B = active belts, no airbags
P = passenger car
42 = Mustang GT 3-dr sedan (hatchback)
E = EFI H.O. 5.0L V8 engine
_ = VIN check digit
J = 1988 model year
F = Dearborn Assembly
______ = ______ 1988 Ford scheduled for production at Dearborn Assembly
Door Tag
Date - 10/87 = October 1987 build
Exterior Paint Colors - 9L 73 = Oxford White (9L), Titanium lower accent treatment (73)
Body - 61B = Mustang 3-door sedan (hatchback)
Mldg - III = Titanium bodyside molding with Blue inset stripe
Int Trim - PG = cloth Articulated Sport seating, low-back front buckets (P), Medium Grey interior trim color (G)