Brake Caliper Adapter Fittings -4 x 7/16"-20 - Pair #1666
$24.95
Brake caliper straight adapter fittings are -4 male with 7/16"-20 threads to go into caliper. These and 3/8"- 24 are a very common size for the older large GM calipers. Check the thread size in your calipers before ordering.
