1964-72 CHEVROLET CHEVELLE REAR DISC BRAKE CONVERSION 10 & 12 BOLT GM REAR END. THIS IS A COMPLETE KIT YOU WILL RECEIVE;. 2 NEW 11" DRILLED AND SLOTTED ROTORS WITH 5 ON 4.5" AND 4.75" BOLT PATTERNS. YOU WILL NEED 14" DISC BRAKE WHEELS OR 15" AND LARGER TO WORK WITH THIS KIT.