Here's the page right out of their catalog, looks like a great 'KIT' and the way to go. I did my old 46 a couple years back NO KIT and the tech support at Vintage Air was great, best thing I've ever added to this truck. Also I'm pretty sure they will send you the instructions for your truck prior to ordering and if they won't ask around on this site, maybe some other bolter will make you a copy?
Here it is, download from their site.
:
http://www.vintageair.com/DownloadsSection/Surefit/Chevrolet%20Trucks/1947-55%20Chevrolet%20Truck%20(wo-fact%20air)%20Inet.pdf
Best of luck
http://www.vintageair.com/catalog11/pg34wc.pdf