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OK, Many thanks for the clarifications guys. I'll go ahead a shell out the cash for a new set (with the bonus that they'll be the right width).
Thanks for the help guys. I've got between 4/32 and 5/32 of an inch of tread left, so I I'm going to go ahead and use them for another winter.
I've got a new Prime with 195/65R15 tires. I've got some snows from my last Prius (2008) that are still in decent condition but a little narrower...