Has 3 Sleeves for Wires. Fits 3 Terminal Brake Light Switch Connectors 1973-1974½ Alternator Connector and the Speedometer "Time Box" used on 1975-1979 models If you look at the brake master cylinder you will see a small electrical switch with three terminals on it. This is the brake light switch. And this is the rubber boot that keeps it from rusting and getting corroded and so on. I think I could replace this item.