Are you trying to get a certain speed rating? BFG has S rated tires in 295/50-15 for the rear. So does Firestone. They should also have matching 225/50-15 tires for the fronts.
http://www.tirerack.com/tires/...gemark=1&RunFlat=All
Here are some other 295/50-15 tires on ebay:
http://cgi.ebay.com/ebaymotors...12|39%3A1|240%3A1318
http://cgi.ebay.com/ebaymotors...12|39%3A1|240%3A1318
http://cgi.ebay.com/ebaymotors...12|39%3A1|240%3A1318
http://cgi.ebay.com/ebaymotors...12|39%3A1|240%3A1318
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