73up lower ball joints.

If running 67-72 style sway bar You will have to run the 73-76 calipers at the back of the axle centerline not the front of the axle centerline for swaybar clearance with the early bar.

67-72 bar bolts at the front of the K frame, 73-76 bar goes thru the K frame.

If you have to mount the calipers behind the axle centerline because of your swaybar, use a pair of 69 camaro front disc brake flexible hoses to hook them up. 15.5" long, they fit just right.