This mount will fit the LARGE(3002) STHL 14mm bar studs. NOT NOT NOT the 12mm 660 and under bar studs. It however can be used on a 660 with a bar adapter and correct .404 rim drive.

Holzfforma® 36 Inch .404 .063 104 Drive Links Guide Bar For STHL 088 MS880 070 090 084 076 075 051 050 Chainsaw