JEGS and Summit both show steel core rubber gaskets for LA's. Here are the links
http://www.jegs.com/i/Fel+Pro/375/1807/10002/-1
The one odd thing is that it's still a 4 piece gasket, but at least it's steel core nitrile rubber. Price is real good too.
http://www.summitracing.com/parts/mil-41007/overview/make/dodge
More costly but it's a 1 piece gasket. I think if I were in the market it's the one I'd buy.