This part will fit the following:
Echo
CS-590 (C25812001001 – C25812999999) 59.8cc Timber Wolf Chain Saw
CS-590 (C25913001001 – C25913999999) 59.8cc Timber Wolf Chain Saw
CS-590 (C69015001001-C69015999999) Chainsaw Lawn Equipment
Shindaiwa
591 (C36112001001-C36112999999) Gasoline Chainsaws
591 (C69115001001-C69115999999) Gasoline Chainsaws