Casement Window Motorized Drive System Replacement Roto Operator - Roto-Gear Operators for the PowerDrive Systems - Both styles available - For the 6" guide bar CN 28 to under CN 36 width and for the 10"  guide bar - CN 36 width and over. 11800740, 10811423, Included are the # 8x1 Phillips flathead wood screws, 11800740, 10811422

Specify Guide Bar Length - 6" or 10" - In "comment section" at Checkout.