This may sound stupid but where can I find my rpo codes for my car. Like the subject says it is a 85 tpi trans am. Thanks in advance.

Should be in the center console glovebox, stuck to the passenger side of the compartment. Thats where mine was on my 85. If its there, make sure the VIN matches the one on your car, its getting to the point in time where its quite possible the console is from another car.