55-64 Thunderbird Front disc brake conversion kit. This kit bolts direct to your spindles. No need to remove or modify them. We use easy to find wear parts as the basis of this kit, so you'll have easy maintenance for years to come. The 56 and 57 came with 15 inch wheels and they will work great with the kit. The 1957 came with 14 inch wheels, some slight grinding to the caliper may be needed to fit the stock 14 inch. For 58-60 14 inch wheels are fine. For 61-64 you will need 15 inch wheels.