1964 plymouth Valiant QA1 upper and lower control arms. What disc brake kit works ?

Thank you for your response

So if I want to do big bolt Pattern I will have to get the Control arms for a 73 and up ? correct?

Yup, that would be the way to go. Then you just use 73+ A body or FMJ spindles, and you can use the 73+ disks or any brake kit that fits a 73+ disk spindle.

You can get brand new spindles and brake kits from DoctorDiff.