DISCONTINUED: Bilt Well Casement Operator with Large 7/8 inch round nylon button, 10-1/2 Straight Arm measured from the center of the operator to the center of the button.
The replacement operator has a smaller nylon button and requires changing the operator and metal track on window sash.
Note: 10-1/2 inch straight arm is replaced with a 9-1/2 inch arm.

Bilt Well Replacement Operator Hardware:
55031 - Left hand operator with 9-1/2 inch arm
55160 - 11-3/8 track with 4 screw holes
55311 - Handle, if needed