I believe the Maverick spindles are identical, or nearly so, to the Granada stuff with a steering arm that is incorrect for 64.5-66 Mustangs. This can be corrected with a bump steer kit or a couple other ways, but it is better to star with the correct setup. The Maverick stuff would be excellent for a 67-70, but not so much for your 66. For about $525, CSRP provides a kit (either with 4 piston calipers, Granada style spindles with corrected arms or the 68-70 calipers/spindles) that includes absolutely everything NEW (including master cylinder, hoses and even bearing grease and caliper lube) for the swap except for the hard steel lines. You can't beat the price, ease of installation or customer support/service.