1940-50's I think, check this out. Found it on the web, maybe it will help..
http://www.yesterdaystruck.com/cgi-bin/ ... =wwwboard1
Response: Re: Have widow maker wheels and need source for 1-piece ones
Poster: truckdog62563 Date: 01-29-2008 08:34:57 Thread: 28809.html
Man are you in good company. Budd, Motor Wheel, and Kelsey-Hayes listed both "lock ring" style and "side ring" wheels in their catalogs back in the day with your 5 lug x 8" pattern. While the wheels were made and sold by these companies, they all used outer rim designs from either Firestone or Goodyear. It seems that only Ford, though, made exclusive use of the deadly "side ring" Firestone RH-5° design where the rim's halves connect at the middle of the wheel. It appears that more and more shops are opting out of working on them for insurance/liability reasons.
Replacement "lock ring" wheels might be found at Stockton Wheel in CA, plus I've heard that Les Schwab on the west coast sometimes has reconditioned wheels available. Also, Bob Jones, who I suspect will be by here sortly, knows of another source that escapes me at the moment. I've had my best success on my trucks doing junk yard searches. Be careful, though, to make sure that any wheel you get has the lock ring mounted on it. You never want to buy a wheel and ring separately because there were many different designs. Mix matching rim and ring can be deadly too.
Budd and Accuride also manufactured one piece rims with this bolt pattern for tubeless radial tires into the late 1970s in both 19.5" and 22.5" sizes. They are VERY sought after by Ford, IH, and Dodge Travco motor home collectors. The only source I know of that keeps an eye open for these is Chuck Mantiglia of Chuck's Trucks in CT. His web page is
http://www.chuckstrucksllc.com. Stu