Please help!!! I need some answers for my Kyocera Strobe KX-21!?

I want to buy a faceplate, or a skin for my Kyocera Strobe KX-21. They don't make products to fit the model but they make stuff for the Kyocera Strobe K612 and the Kyocera Switchback. What's the difference between them all and can I buy products for my phone that are made for the other models?