Discontinued / Replace with:
Operator #52.11.00.211 (shorter arm)
Track (includes guide) #55104
Cover/Handle Combo:
Left Hand #55309

Truth Traditional Style 13-1/2 single straight arm casement operator with Stainless Steel Roller Button
They style of housing has been discontinued and has been replaced with the Ellipse Series

Brand: Truth
Style: Traditional
Arm Type: Single
Arm Length: 13-1/2 inch
Roller: 9/16 inch Stainless Steel
Handed: Yes, Left Hand as Shown 
Markings on Base: 45251

Color Options:
White 

Note: Straight arm casement operators arm measurement is from the center of the operator to the center of the roller. See additional images