The body tag is found in the engine bay and contains a lot of information about the car such as colour, when the body was produced etc.

Let's start decoding the body tag.

10B - That number (top left corner)  indicates that the body was build in the second week of October (A - First week, B - Second week, C- Third week etc). Usually the engine is build in the previous month (in this case september) or at the latest in the first week of October.

Style 64 - 0667  - That indicates that the corvair was build in 1964 (64-), Spyder Model (06), Convertible (67)

Body WR - 1259 - That indicates that the car was build at the Willow Run assembly plant (WR) and assigned the sequential body number 1259, which means she was the 1259th Corvair built at Willow Run for ’65.

Trim 712-2 -  Black Interior(712)  with top colour black (-2)               -   For comprehensive colour codes details please click here

Paint 936-E - Ermine White exterior (936)  with black interior colour (-E)   -  For comprehensive paint details please click here

ACC W2LP3C -  Tinted Windshield only(W), 4 Speed(L), Convenience group (2 speed wipers, w/ washer, day/night mirror, glovebox
light, backup lights -P) and  Padded dash (C).

For the Spyder the following body tags decoding applies 

1962 Fisher bodytags ACC line. (WR)

Willow Run bodytag codes (NO Group Numbers i.e. no numeric indicator)
A = Direct Air heater (Always listed 1st and listed on every WR car in survey)
D = Spyder
E = Bucket seats on 4 door models
H = Padded dash
N = Powertop
K = Tinted Glass (all windows)
J = Tinted Windshield?
L = Convertible top code followed by a number indicating color.
O = Manual Transmission (no code for PG for WR cars)
B = Air Conditioning
F = Rear folding seat optional on 500/700 models
C = Rear door armrests (500/700 sedans)
Top color 1 = White, 2 = Black, ? = Blue, 4 = Cream (Blue is probably coded 3)

1963 Fisher bodytags ACC line. (WR)

The Letters are listed in groups. Letters following a number is in that group. The code letters are listed in the order they would appear. Some letters are in more than one group
WRN and VN Bodytags
First Group ( no numeric indicator)
E = RPO A01 Tinted Glass ( Soft Ray glass in all windows)
F = RPO A02 Tinted Windshield
L = Rear folding seat (500-700models)

2 = Second Group
C = RPO Padded dash
D = RPO Powertop
E = RPO C60 Air Conditioning
M = RPO Powerglide
L = Manual trans (VN only)
Y = Rear seat Speaker

3 = Third Group
C = RPO Turbocharged Spyder option
P = ? (VN only) might be Comfort and Convenience -- as with '65, may indicate two-speed wiper and washer (carryover from FS Chevys built in same plant)

1964 Fisher bodytags ACC line. (WR only)

The Letters are listed in groups. Letters following a number is in that group. The code letters are listed in the order they would appear. Some letters are in more than one group
Tag style change at either 10C or 10D
First Group ( no numeric indicator)
E = Tinted windshield and side glass
D = Power Top (Manual top standard, no indicator)
W = Tinted Windshield only

2 = Second Group
M = Powerglide Automatic
L = 4 Speed
E = Air Conditioning
P = Convenience group (2 speed wipers, w/ washer, day/night mirror, glovebox
light, backup lights)
R = Rear speaker
S = Rear antenna

3 = Third Group
C = Padded dash
No other letters reported in group 3

4 = Fourth Group
F= convenience group Z13 (not available with 2P but includes all 2P options
plus remote door mirror)

5 = Fifth Group
W = Custom Dlx seat belts with retractors RPO A49 (after Feb 1, 1964)
V = Custom Dlx seat belts no retractors RPO A37 (before Feb 1, 1964)
O = ?
Z = ?

Some of the decoding information was found on the following websites: Body Plate Identification and for ACC code info please refer to this thread