ok idk if this is already in the tech section but i found thins while at school when looking at alldata for the rpo labels so if this is helpful post if not its cool
LOCATION OF RPO LABEL
To find the location of the RPO label, you can look at the Carline chart below. Locations of RPO labels vary by "Carline." To determine the "Carline" refer to the 4th and 5th digits of the VIN label on 1985 to present automobiles, 5th digit for 1982 to 1985 automobiles and 6th digit for all trucks. See: Vehicle Identification Number (VIN)
TYPICAL RPO LABEL
A typical RPO label is shown in the accompanying image.
CARLINE LOCATION
A ......... On spare tire cover or RH rear wheel well.
B35 ...... On spare tire cover (85-91).
B35 ...... On rear quarter panel (92).
B19-69 ... On deck lid.
C ......... (Oldsmobile & Buick), On deck lid, on spare tire cover, underbody, or jack storage container.
C ......... (Cadillac), On spare tire cover, underbody, or jack storage container.
D ......... On deck lid.
E ......... On deck lid (85-90).
E ......... On underbody spare tire well (91-92).
F ......... On console door (85-90).
F ......... On inside of rear quarter trim panel door.
G ......... On deck lid.
H ......... On deck lid, underbody, or jack storage container.
J ......... On spare tire cover.
K ......... On LH rear door or on deck lid (85-90).
K ......... On underbody spare tire will (91-94).
L ......... On spare tire cover.
M ......... On spare tire cover.
N ......... On deck lid (85-87).
N ......... On spare tire cover (88-94).
P ......... On front compartment LH fender well.
R ......... On spare tire cover.
S ......... On spare tire cover or deck lid.
T ......... On spare tire cover.
U ......... Inside of glove box door.
V ......... In spare tire wheel well.
W ......... On spare tire panel cover.
X ......... On spare tire cover.
Y ......... Under rear floor panel compartment (84-85).
Y ......... On front floor console door (86-94).
1
