Genuine OEM Echo Oil Pump w/Gear Worm P021010890 Qty 1 Auto Oiler Assy w/Gear Worm ( incl # 4-7 ) Fits the following Echo: 358Ts S/N: C35714001001-C35714999999 358Ts S/N: C35813001001-C35813999999 358Ts S/N: C67515001001 - C67515999999 CS-271T S/N: C21112001001 - C21112999999 CS-271T S/N: C21211001001 - C21211999999 CS-271T S/N: C21313001001 - C21313999999 CS-271T S/N: C26312001001 - C26312999999 CS-271T S/N: C32814001001-C32814999999 CS-271T S/N: C67115001001 - C67115999999 CS-350TES S/N: C24126001001 - C24126999999 CS-350TES S/N: C48736001001 - C48736999999 CS-355T S/N: C23411001001 - C23411999999 CS-355T S/N: C23512001001 - C23512999999 CS-355T S/N: C23613001001 - C23613999999 CS-355T S/N: C33414001001 - C33414999999 CS-355T S/N: C67415001001 - C67415999999 CS-360TES S/N: 37001001-37999999 CS-361P S/N: C51814001001-C51814999999 CS-361P S/N: C51913001001-C51913999999 CS-361P S/N: C67315001001 - C67315999999