small bolt pattern disks to big bolt pattern

If your car already has the small bolt 4 piston disc the seller shows these rotors are all you need to go big bolt pattern. They appear to be the mustang rotors with the work done.

[ame="http://www.ebay.com/itm/A-BODY-66-72-DRILLED-AND-SLOTTED-DIRECT-REPLACEMENT-ROTORS-4-5-INCH-LBC-/221204715527?pt=Vintage_Car_Truck_Parts_Accessories&hash=item3380d41807"]A Body 66 72 Drilled and Slotted Direct Replacement Rotors 4 5 inch LBC | eBay[/ame]