Ok got the car in the shop and cleaned u the tag to read it better.

V6X V8X 26 L2 974
G75 M21 N41 N76 R11 V21
KY5 U B41 G11 G55 G65
KY5 A1X9 000 CO4 148527
E58 D21 VS29 L4B XXXXXX


Below is what I decoded it at. Does anyone know what the unknown lines are? Sadly this car has no build sheet thanks to mice and rodents. Just trying to help out customer with his decoding the car. He is restoring it. It was his high school car so has meaning to him.
:
Unknown
Unknown
Unknown

: Unknown
Unknown
Unknown

: Sequence number

E58: Exterior Color
D21: Trim - Luxury, Vinyl Bench Seat, Unknown Color
VS29: Int. Door Frames
L4B: Build Date: 4B
xxxxxx: Order number

KY5: Top Color
A1X9: Unknown
000: Unknown
C04: Unknown
148527: Unknown

KY5: Unknown
U: USA Specifications
B41: Front Disc Brakes w/Standard 10in RR Drum
G11: Tinted Glass (all)
G55: Outside LH Remote Painted Racing Mirror
G65: Outside RH Manual Painted Racing Mirror

G75: Dual Painted Racing Mirrors
M21: Roof drip rail moldings
N41: Dual Exhaust
N76: Coolant Recovery System
R11: Radio Solid State AM (2 Watts)
V21: Performance Hood Treatment

V6X: Longitudinal Stripes, Black
V8X: Tranverse Stripes, Black
26: 26in Radiator
L2: Unknown
974: Unknown


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