Widest Tire on Stock Pony

Sweet, thanks guys. I think I am going to go for 255/50/16 in the rear and leave the front stock. I need a set 1" wheel spacer adapters but do not know where to get them. Any ideas?
 
I now have Kumho Ecsta Supra 712 in the rear with some Continentals up front (they were free). I think I am going to get either 1" or 1.25" wheel spacer adapters for the rear and get the Kumho Ecsta Supra 712 again but this time 255/50/16. I think they look pretty sweet with the tread pattern. Plus, they are pretty cheap. I do not do burn outs or drive like a mad man so I really do not need top of the line tires. They are listed as Ultra High Performance for the summer so I think they will be fine.
 
The Kumho Ecsta Supra 712 are AWESOME TIRES! I'v run them before they perform amazingly on wet and dry and I didn't even have a vibration with I was hitting almost 240k an hour! lol they are a little slippery when cold but once they warm up they grip like glue! I'm definetly buying them again! I had Michellin Pilot Sports before but they didn't last long and one blew a sidewall on me and almost destroyed my 17" Centerline Sabers!