The Nokian WR-G2 Get some very good reviews.

A few of the Legacy chaps use them and rate them very highly, they are also available in an 18

225/45R18 95 V XL
225/40R18 92 V XL
235/50R18 101 V XL
235/40R18 95 V XL
245/50R18 100 V Run Flat
245/50R18 104 V XL
245/45R18 100 V XL
245/40R18 97 V XL
275/45R18 107 V XL


Not sure the best place to get them but most stockists would be able to order in I would imagine?


Other option if you can is to run a second set of alloys with a small rim size, better prices available