mopar rally wheels question

so at what point did mocars start receiving the rally wheels?

dealership upgrade or factory?

I have a 1966 barracuda that I've had for 19 years and it came with 14in small bolt rally wheels, was this a dealership up grade?

The old man I bought the car from father had passed away and sold me his dads car when I was 16 he said as far as he know the car came with them when his dad bought it new.

any input would be great