I have not seen a complete decal set either. I would go to a custom graphics shop. They should be able to take the fender stencil and make a decal from it.
There was an article a while ago in one of the rags about this. They had a set of Yenko style side stripes made with a custom name in the rear part of the stripe (i.e., they didn't put "Yenko" on it). It looked pretty neat.
I just painted my SS a year ago and went with the Stencil/Decal like the factory, but when it came time to paint it, we painted teh door stripe and kept the decal, looks nicer that way, but as far as a total decal kit no I don't think I have ever seen one..