Got a classic Ford or Mercury that needs some brake love? This master cylinder is built as a direct replacement for a bunch of vintage models from the early-to-mid 60s. We're talking Mustangs (1964-66), Falcons, Thunderbirds, Galaxies, Comets, Rancheros—the list is pretty long (check the full compatibility list to be sure). The part number matches OE refs like C1SZ-2140-A and C5ZZ-2140-B, and it comes with the reservoir and cap already attached. The housing is made to mimic the original casting material, so it should fit right in and perform like it's supposed to. Brakes aren't something to mess with, so getting a proper, precise part matters. Double-check your vehicle year and model before ordering, and if you've got questions, the seller says they're happy to help. Keep that classic stopping safely.