This is the most common one for stock front axle trucks,

http://www.ecklerstrucks.com/chevy-truck-front-sway-bar-kit-1947-1955-1st-series.html

Lots of venders sell it, I suspect only one guy is making them and selling to all the venders. I used one for my '37. Its a pretty straight forward install. You need to drill a few holes and install the mounts at the u-bolts. Here is a link to my install.
http://www.stovebolt.com/techtips/driveline/swaybar/index.html

1937 Chevrolet Inline-powered Streetrod