It's simple, the engine codes they used were taken from a source that was wrong. I have one of those sources:
Mustang Red Book, by Peter C. Sessler.
The VIN you provided is wrong. You mistyped the restraint code (fourth position). It should be an "L" not a "K". Also, of the four engine code you typed above, one is wrong. The "0" should be a "D".
https://www.fleet.ford.com/maintenan...ls/default.asp
VIN Results
VIN: 1FA
KP42T3SF157003
A valid 17 character VIN should be entered. Please go back and try again.
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VIN Results
VIN: 1FA
LP42T3SF157003
World Manufacturer Identifier - 1st, 2nd, 3rd Positions
VIN Code: 1FA
Assembly Country: USA
Make: Ford
Body Style: Coupe
Restraint System Type (Passenger Cars) or Brake Type and GVWR Class (Trucks and Vans) - 4th Position
VIN Code: L
Restraint: BELT, ACTIVE, AIRBAG
Line,Series Body Type - 5th, 6th, 7th Positions
VIN Code: P42
Vehicle Line: Mustang
Series: GT
Vehicle Type: Car/Minivan
Engine Type - 8th Position
VIN Code: T
Engine: 5 L
Cylinders: 8
Fuel: Gasoline
Horsepower: 215 HORSEPOWER
Model Year - 10th Position
VIN Code: S
Model Year: 1995
Assembly Plant - 11th Position
VIN Code: F
Assembly Plant: DEARBORN: DEARBORN, MI
Production Sequence Number - 12th - 17th
VIN Code: 157003
Prod Sequence Number 157003