This bar adapter allows Stihl bars for the MS660 and MS661 to be installed on Echo chainsaws. 

 

For reference:

Echo: 8mm bar studs

Husqvarna: 9mm bar studs 

Stihl Ms660/661 and other large Stihls: 12mm bar studs

Stihl MS880/MS881: 14mm bar studs. 

GB Titanium Bar Adapter GPSB8-12 (8mm to 12mm)

$20.00Price