I talked to CCW and they said they are built the same so these wheels should work for both IRS and SRA. The most you sould need is a spacer to push them out but that's up to you.
Backspacing is 6.25 for the rears I beleive. If not it is 6.50 but either way these will word for either IRS or SRA.
Rear tires are MT ET Streets 26x11.5-16
Front tires are Firestone champion tires. They are a vintage racing tire that are 500x5.25-16 which means they are 26" tall and 3.5" tread width. These are the tires that CCW sells with the wheels with the wheel/tire package.