From the over 3300 RPO codes that I've compiled
BV3 = ORNAMENTATION, INTR, I/P, BLACK
B60 = DECAL PACKAGE, 01
D14 = ARM REST, FRT DR, RH & LH
D7C = GEAR, SPEEDO DRIVEN
D9A = SENSOR, VEH SPD
GH3 = AXLE REAR, 2.77 RATIO
WW6 = APPEARANCE PACKAGE, AERO #6
80A = STRIPE COLOR, ACCENT, TWO TONE, RED/DK SAPPHIRE
84P = WHEEL COLOR GRAY (91)
Typically RPO codes do not use the letter "I". It can be mistaken for the number "1" so if it looks like "I", treat it as the number "1".
Same holds true for the letter "O"; it is to be read as the number "zero".
I hope this helps.