M4700 (2wd). Outer Air Filter R1401-42270. Inner Air Filter R2401-42280. KX121-3 (SN : 20000-29999) - 061400 AIR CLEANER. KX121-3S (SN : 30000-69999 / Super Series) - 061400 AIR CLEANER. KX121-3ST (SN : 70000- / Super Series / Tier 4) - 061400 AIR CLEANER.
