This Truth Surface Mounted Window Operator is usually used on commercial aluminum windows. It features an 11" long arm, measured from the center of the housing to the center of the metal roller.
The Truth 23.49 is a Dyad Operator is rear mounted. The linkage arm is 9-1/4 inches overall length, 8-3/4 inches hole to hole. The rear mounting holes are 5 inches on centers.