Thanks for all the replies guys!!!

The thing is that I have a 70 cuda that is coded for the R11 radio.

And I just happened to find an original 70 Barracuda dash but it had the 3 speakers. Thought Id be able to use it maybe if there were those kind of screw ups at the assembly line, but since there were not, I dont think Id like to use it if my car is not coded for it.