Old school high/low relay

Hey guys. I'm not a trucker or anything but more of a man with a predicament. So long story short my friend and I came across an old abandoned international big rig. So naturally we poked around and grabbed some neat stuff. My friend grabbed (what I believe to be) an old school high low gear electric relay switch. He is using it now as a relay in his jeep for backup lights. I wanted to do the same so I have been scouring ther interwebs for many days now and came up empty handed as to where I can get something like it. Pep boys sells something similar but it's not quite as large and doesn't really have any character to it. Below is the picture of the relay itself on his jeeps shifter. Hopefully someone can point me in the right direction as to where I can get something like this.

Thanks!
jkowners.com/forum/picture.php?albumid=1570&pictureid=10079

 

Sorry. I got a few better pics. Ill post them.