Noss machine (nossmachine.com) makes a case saver that looks similar to the GYT-R billet sprocket cover, but with the addition of a wing that actually protects the case if the chain would take off in it's own direction.
I think ModQuad or one of those other billet companies makes a more traditional style case saver, i remember seeing it in a rockymountainatv catalog, motorsport, or something like that. I think it was listed for the raptor 350, but there's no reason why it wouldnt fit the warrior if it works on the rap 350.