Hedpe- perhaps you may be able to use your spare in the trunk?

As far as tires go- these Mich are relatively new on the market- and you may have a tough time finding them used in that sizing.

You may be able to make friends with the local independant tire hauz- and get them to test fit a couple of these for you- usually they have a 30 day ride guarantee / return policy- no questions asked...check for details- - .

I have (4) 35k mile OE E500 wheels available non-chrome/ great cond. if interested. RFJR above has chromies available for $200- a steal!

hope this helps
-fad