BeeKeeper was kind enough to decode my fender tag.
RS23:
Plymouth Belvedere,Satellite
Special, GTX
2 Door Hardtop
L9G: 440 375HP 1-4BBL 8 CYL
1969
St. Louis, MO, USA
: Sequence number
E86: 440 cid 4 barrel V8 (High Performance) 375hp
D32: Heavy Duty Automatic
Transmission
B5: Bright Blue Metallic Exterior Color
B5: Roof
P6D Trim - Basic, Cloth/Vinyl Bucket Seats, Unknown Color
B7: Unknown Int. Door Frames
128: Build Date: 28th JAN
: Order number
A01: Unknown Top Color
A04: Basic (Radio) Group
C21: Center Front Seat Cushion
C55: Bucket Seats
G33: LH Remote Racing Mirror
J25: 3 Speed Wipers
L31: Hood/Fender Mounted Turn Signals
M21: Roof drip rail moldings
M33: Body Side Moldings
R11: Radio Solid State AM (2 Watts)
V1X: Unknown
V6W: Longitudinal Stripes, White
END: End of Sales Codes
I found a buddy seat which was missing, and went with the red stripe instead of red because I thought it tied in better with the grille & trunk panel.