i agree with keeping for winter as one option, but you could also consider selling 3 of the wheels and keeping one as a back-up. you could probably make more selling the 3 wheels individually than as a whole set so you may end up with the back up wheel for little cost.
i also think the longer you hold on to the wheels the less they will be worth (i.e, the more 3 series that are sold, the more the style 397 wheels be available for sell on the market)
just my .02
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