Replace Carburetor OEM Number:<br> <br> 4203 120 0601<br> 4203 120 0603<br> 4203 120 0605<br> 4203 120 0607<br> Walbro HD-4A HD-4B HD-13B<br> <br> Fits Stihl backpack blowers: SR320, SR340,SR380, SR400, SR420, BR320, BR340, BR380,BR400 & BR420<br>