vintage air offers a unit that contours under the dash and works great. Comes with everything you need. The one area you will need to look at is the compressor mount it is for a small block chevy not sure what you are running so look into that.
Also on mine I opted for the black knobs and relocted them and also made a center console. But the plain jane unit you get from them is complete with all controls
http://img.photobucket.com/albums/v281/iceburgh/1953%20truck/IMG_0233.jpg
This picture shows my uncles truck with the controls in place
and also the unit. Itwill take away some of your glove box storage
http://img.photobucket.com/albums/v281/iceburgh/franks%20truck/DSC01783.jpg