HIFROM TM Replace Carburetor Carb FITS POLARIS SPORTSMAN 90 2001 02 03 04 05 06 (2001-2006) ATV Manual Choke 1. For 90 (2001-2006) 2. Intake Inner Diameter : 19mm 3. Intake Outer Diameter: 23mm 4. Air Filter Inner Diameter: 31mm, Air filter Outer Diameter: 37mm. 5. HIFROM carbruetor from Professional Factory; Professional technical support; if you unsatisfy, can return to our USA warehouse, no risk