Replacement vented 11-5/8" O
so they do require a 9" Ford 3rd Member (sometimes referred to as a Chunk)
FEATURES A DEEP PISTON DESIGN & INCLUDES A PISTON ADAPTER THAT ALLOWS IT TO BE USED FOR MANUAL & POWER APPLICATIONS
this isn't the groover you need
REMOVABLE END PLATES ALLOW YOU TO RUN OPEN HEADERS WITH EASE
COILOVER SYSTEM,ARMS,CURRIE REAR END,WILWOOD 11" DRILLED BRAKES,RED,64-67 GM A X-Body Front Kits 1962-1967 Replacement vented 11-5/8" OBRAND NEW RIDETECH COILOVER & STRONG ARM SYSTEM WITH CURRIE 9" FORD REAR END, SOUTHWEST SPEED POSI TRAC 3RD MEMBER, AND WILWOOD DISC BRAKE KIT, INCLUDING FRONT CONTROL ARMS, REAR TRAILING ARMS, SPINDLES, MUSCLEBAR FRONT & REAR SWAY BARS, 11" DRILLED ROTORS, RED BRAKE CALIPERS, POWER BRAKE BOOSTER, MASTER CYLINDER, PROPORTIONING VALVE, BRAKE LINES, PARKING BRAKE CABLE KIT, AND MORE (PART #11230201 54). THIS COILOVER SYSTEM IS SPECIFICALLY DESIGNED FOR