5 on 4" Discs on a '65 Barracuda. Year/car?

I am trying to figure out what year discs are on my Cuda.
I recently bought the car and I am a new Mopar man. I know they came stock with drums and that the hot setup are discs and spindles from a '75-'76
A-body... But those are 5 on 4 1/2" and the ones i have are 5 on 4".

Any ideas on what year/car they could be from? I want to buy a Wilwood front disc set-up and i dont know what year to order.

Any help would be greatly appreciated.

zak