Well, I recall ATI used to make a variant of their Monte Carlo stock for it, but it was pretty rare and looked to me like it was just a modified version of their regular SKS stock. I only ever saw one and didn't get a chance to look at the insides, but they put some type of panel to cover up the forward part of the magazine well.
But in answer to your question, nobody now makes them as these SKS's are fairly rare.