Decoding a 1967 Build Sheet

I recent purchased a 1967 GS 400 and have most of the original documentation - the build sheet and protecto plates were included. After checking out some of the threads here, I have determined what a lot of the numbers mean, but could not figure everything out. Any help would be appreciated in deciphering these numbers.

Here are the numbers (with what I figured out):

VIN: 446177B114527 (Buick GS 400 2 door hardtop coupe built in Baltimore)

Body Plate:

01B (January, 1967, second week)
44617 (same as VIN)
198 (Black Vinyl interior)
172 (Job #)
BAL 917 (917^th GS 400 body in Baltimore)
R2 (Apple Red, black vinyl roof)
418384 (??)

Build Sheet (a lot matching body plate data):

Sequence: 785
Mo. & Day: 01, 10
Job: 172
Style: 44617
Body No. 000917
Trim: 198
Seat: B (Assuming Bucket - as installed)
Paint: R2
First Group: E (??)
Second Group: 2C_EZG_ _R (??)
Third Group: empty
Fourth Group: 4F_ _ _HC (??)
Fifth Group: 5K_ _ _Y (??)
F & SO-COPO: Empty
Last block: 418384 (??)

Protecto Plates:

J E Bickers 04-126 (Dealer ??)
6111 N 18th St 02-04-7 (Delivery Date ??)
Arlington VA 7B114527

198 RR (Trim & paint ??) 446177B114527
NR227 (Transmission ??) OX (??) S (??)
BA346 (??) 2814 (radio ??)

Engine: 7B11457 (stamped on driver's side between exhaust ports) & 400 1381624 (casting above bell housing mount.)
I don't have any numbers from the transmission right now.

From what I see, everything matches and the engine is original. As far as the codes on the build sheet and the protecto plates, I have no idea what they mean.

Since this is my first post here, let me know if I am asking for too much at the same time. Also, if pictures would be helpful, please let me know.

Thanks,

John

Build sheet:

First Group: E (??)
E = Tinted glass (all windows)

Second Group: 2C_EZG_ _R (??)
C = Custom padded seat cushions
E = Air Conditioner - Manual
Z = 3-spd auto transmission
G = Long console
R = Rear seat speaker

Fourth Group: 4F_ _ _HC (??)
F = Remote controlled outside driver's mirror
H = don't have this one
C = ext. belt reveal molding

Fifth Group: 5K_ _ _Y (??)
K = Door Edge Guards
Y = Deluxe Seat Belts


Protect-o-plate:

04-126 = selling dealer's code for:
STEWART BUICK INC.
910 N GLEBE RD.
ARLINGTON VA

NR 227
NR = engine production code = 400 V8
227 = build date code

OX = rear axle code = 2.93 posi, Series 44600

S = build date code = January 1967

BA 346
BA = transmission code = ST400 automatic for 400 V8, GS 400
346 = build date code, 12/13/1966

2814 = option codes
2 = Air Conditioning
8 = Power Steering
1 = Power Brakes
4 = Radio - Sonomatic

Thank you for the information, and for the quick reply. I had read elsewhere that the build sheet was not able to be decoded. That was obviously not the case.