Brothers a/c, heat & defrost systems are designed especially for your 73-87 chevy & GMC trucks. These kits are constructed to mount to existing holes in your dash and firewall without fabrication. Kits include evaportator, compressor, drier, all mounting brackets, hardware, louvers, duct hose, pre-formed aluminum lines, hi/lo safety switch, wiring harness, new backlit 3 lever control panel and installation instructions.