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, duct hose, pre-formed aluminum lines, hi/lo safety switch, wiring harness, new backlit 3 lever control panel and installation instructions.