RM21J8G11xxxx

RM21 = Plymouth Road Runner 2dr coupe
73 = 426 cu.in. HEMI engine w/2 4bbl carburetors
5 = 395 - torqueflite automatic transmission
45 = F70x15 Goodyear Speedway "red stripe" nylon cord tires
912 = Scheduled Production Date: Tuesday, September 12, 1967
164855 = Shipping Order Number

2/5 = 535 - drip trough mouldings
3/0 = 540 - belt mouldings

A/4 = 404 - 3.23:1 axle ratio (8-3/4")
X/8 = 408 - sure-grip

TRM/DL4 = deluxe bench seat interior - "parchment & tan"
PNT/MM1 = "turbine bronze metallic" mono-tone paint
U/Y = "medium tan metallic" Upper Door Frame paint

A/1 = 491 - 26" radiator
R/1 = 421 - Solid State AM radio

m/6 = 536 - LH mirror remote

& inspector's stamp in upper right