Personal preference on what components to use:
67-72
Front:
Air Ride Technologies Cool Ride kit
ECE 2.5" spindles
Rear:
Air Lift rear kit
73-87
Front:
Air Ride Technologies Cool Ride kit
3" DJM spindles
Rear:
Air Ride Technologies weld on parallel 4 link kit
88-98
Front:
Air Ride Technologies Cool Ride kit With Upper/Lower control arms
Rear:
KP Components bolt on parallel 4 link with canti attachment
99-05
Front:
Air Ride Technologies Cool Ride kit with Upper/Lower control arms
Rear:
KP Components bolt on parallel 4 link with canti attachment
Air Management for all:
Engine driven compressor(most common is Air Lift Air Commander kit)
Valves
SMC
Tank
Depends on vehicle but I wouldn't run anything under 10 gallons on an engine driven compressor.
Best selection of tanks:
http://www.suicidedoors.com/products/airtanks.htm
Fittings
DOT Compression from Swagelok, SMC, Parker, Alkon, etc....
Air line
DOT line
Good selection of line:
http://www.suicidedoors.com/products/dot_airline.htm
http://www.innovativeairsuspension.com/site.htm