i have a 1960 apache and i want to give it the 4 control custom heater. do all i have to do is add the outside air unit? also i have found a 65 and 66 outside air unit, will it work on my 60 apache?


2007 2500HD Duramax crewcab
1965 3/4ton 4x4
1960 1/2ton 2wd