Amesbury Truth 30706.80 3-hole casement window track. The track is mounted to the window sash and the operator arm fits into the track.

Application: Wood and Vinyl Casement Windows
Length: 11-3/8 inch
Screw Holes: Three (3)
Material: Stainless Steel

Priced and sold each.

Related parts:
30706.92 3 hole track
30150.93 4 hole track

Additional Information:
Easy installation, operator arm is installed and removed from notch in center of track.
Truth Hardware Casement Window Track fits Surface Mount Casement Window Operators that have 13-1/2 inch long Operator Arm.
The operator / track system has been used on both wood and vinyl windows.
Truth casement window operator channel guide ( track) is very common and used by many window manufacturers.
Recommended Screws: Wood windows # 7 x 7/8 inch flat head sheet metal screws
Recommended Screws: Vinyl or Metal windows # 7 length and thread determined by material and profile
Actual screw size may vary depending on application and window material.