I'm having trouble finding availability for the Nokian Hakkapeliitta R2 tires for the model X. For the model S it seems easy... The 245/45R19 seems commonly available at a local tire shop and at discount tires and other places online. I'm in the Denver area but also looking online. However for the tires for the X I'm not having much luck. I've looked for the nokian r2s in several sizes... SUV 265/50R19 (the idea being get 4 new 19 inch wheels), SUV 265/45R20, SUV 275/45R20 and only the 275/45R20 is in stock anywhere... But if I understand correctly I would need two of each type of the r20 tires? So should I be trying to special order something in? Try some other size such as getting the 275 throughout? Switch to the wrg3 which is in stock and just go with those or switch to a different brand? Thanks.