Ize tires are on a 2003 trail blazer?

The correct size for tires for the 2003 base model Chevy Trailblazer with 17-inch rims is P245/65R17 105S. The correct size for the base Trailblazer with the 16-inch rims is P245/70R16 106S, and the correct size for the 2003 Trailblazer EXT with 17-inch rims is P245/65R17 105S.