This information was extracted from the UK FTO Forum

1. Chassis Series Classification
D = FTO

2. Model Classification
E2 = 1800cc 4G93 4 Cylinder
E3 = 2000cc 6A12 V6

3. Service Classification
A = Passenger Car Vehicle Shape

4. Year Classification
000xxxx = 1994 - 1995
010xxxx = 1996
020xxxx = 1997
030xxxx = 1998

5. Options
These numbers are specific to the options chosen on
your vehicle and can be decoded by a dealer.

6. Body Shape Classification
H = 2 Door Coupe

7. Gear Box Classification
Y = 5 Speed Tip-Auto
R = 4 Speed Tip-Auto
N = 5 Speed Manual

8. Equipment Classification
U = GS
H = GR
G = GPX
X = GX
F = GP

9. Engine Classification
E = 4G93 1.8 16v with Electronic Fuel Injection
M = 6A12 DOHC V6 with Electronic Fuel Injection
H = 6A12 MIVEC Engine DOHC V6 with Electronic Fuel Injection

Other codes (not confirmed)
FH4 - GP Version R Aero
FH3 - GPvR