Small bolt pattern disc upgrade

Not sure of the compatibility to your car but why not switch to KH stock front discs 67 - 68- 69? SBP

I have seen the entire setup, spindles etc here for reasonable price.
Expense. KH used runs 3-350 the you need to machine rotors or buy new...500 all new seemed too good to be true, hence my initial question. Im new to all this so I figured Id ask u guys..