Disc Brake swap-A body Rotors

I have searched many threads for answers to this question. I am in the process of swapping 74 dart front disc's to my 69 Barracuda. I will have when complete, 4.5"x5 bolt pattern on the front and the 4.0"x5 bolt pattern on my rear 8 3/4. My question is, can front rotors be purchased with the 4.0"x5 pattern as i will need rotors soon anyway? I really dont want to change rear axles to 4.5"x5 pattern. Does anyone have any other suggestions to, in the end have the same bolt pattern?
Thanks.