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If anyone in SD area wants to rent these from me, just PM. $400 refundable deposit and $100 for the rental. As a favor I'll show you how to mount and dismount them.
They may fit, but your rims will be immediately and severely damaged as the chains are deeper than the tire and will cover the rims by a couple of inches. I looked into this a lot when I was finalizing my order. The chains offered by the OP are the best option out there. I personally decided to go with 19" for this very issue. That, and less worry about pot holes.
Mita offers another option that would fit the 21" rims. Equally as expensive.