This is as I suspected. I have a model 10-6 that has some pitting and considered replacing it. I found a side plate available on "the- bay" for a K-frame. When inquiring about the plate, he informed me of his qualifications as an armorer and gunsmith and assured me that he had never seen one that wouldn't interchange. I was doubtful, but made the purchase and of course the side plate would not fit. The seller agreed to accept the return but implied that I must not know what I am doing.