Here she is. B Body, not A body

Got the Fender Tag on the Road Runner Decoded today.
RM21:
Plymouth Belvedere,Satellite
Medium, Road Runner
2 Door Coupe
G4G: 318 150HP(net) or 170HP(net) 1-2BBL 8 CYL
1974
St. Louis, MO, USA
109650: Sequence number
E44: 318 cid 2 barrel V8 230hp
D34: Light Duty Automatic Transmission
JA5: Dark Silver Poly Exterior Color
D6XW: Trim - Luxury, Vinyl Bucket Seats, Black/White
000: Full Door Panels
820: Build Date: August 20
143641: Order number
JA5: Dark Silver Poly Top Color
U: USA Specifications
B41: Front Disc Brakes w/Standard 10in RR Drum
C56: Bucket Seats
G51: Unknown
J45: Hood Tie Down Pins
J54: Sport Hood
N41: Dual Exhaust
N42: Chrome Exhaust Tips
N85: Tachometer
R11: Radio Solid State AM (2 Watts)
V8R: Tranverse Stripes, Red
V9R: Longitudinal Stripe, Red
END: End of Sales Codes