The new low profile tires don't really lend themselves to large letters. I think BF Goodrich still makes them... for 14" tires. You can buy vinyl stick on letters though at Tred Wear Letters - Raised White Letter Tires in minutes- CUSTOM TIRESTredWear | A new concept in self expression for your tires
. They can still look great with the 17" wheels. Not so much on 20".