Trim Tag Decode....

[JChlupsa]

The Z should be a 2 and under that group the C most likey is a G

Decode for body number: 000594

11A = Built the First week of November.
67-12667 = Custom Interior Convertible.
LOS = Built in Van Nuys California.
742 = Custom Red Bucket Seats.
Z = (A50) Strato Bucket Seats.
C-1 = Lower Color is Ermine White and the Convertible Top Color is White.
A058 = internal plant scheduling code.
Options:
1W = (A02) Tinted W/S only
1D = (C06) Power top convertible
2E = (C60) Air Conditioner
2M = (M35) Powerglide Transmission
2G = (D55) Console front compartment
2S = (U73) Antenna Manual right rear
3S = (Z23) Interior Decor group
3L = (Z22) Rally Sport Package
4P = (L48) SS 350
5Y = (A39) Belts All Deluxe

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by the way the Option group 2S for the rear antenna will let you also know that the car did not come with a rear spoiler
Whats the VIN of the car?