I ordered 20" wheels for my 4.8i. I need winter wheels. My dealer has offered me the 18" 209 wheels with run-flat snow tires for $753 each. Does that sound reasonable?

Thanks

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2008 X5 4.8i | Wheels: Summer> style 336 20" RFT; Winter> style 214 Ferric Grey 20" RFT | Aero kit | ESS E-Flash tune | V1 | LCI Rear Tail Lights | Coding completed | Engine replaced at 90K