I will try and put them do a breif synopsis for you. If you DO have $1m please PM me so I can tell you where to send it.
Let's disect the most common Chally interior code - H6X9, then a few others.
H = High trim grade ( Vinyl)
6 = bucket seats
X9 = Color, black
H6XW = Black and white interior with bucket seats.
H4X9 the 4 stands for bench seat.
H5X9 the 5 stands for cloth inserts. ( salt and pepper)
L6X9 - L stands for low, this was part of the Challenger Coupe package, the "L" got you rubber floor mats insteat of carpet, and Barracuda upholstery with fixed rear side windows.
P6T5 would be;
P - Premium (leather)
6 - Bucket seat
T5 - Tan
If you have any questions just post them here.
T/Ake care,
Barry