Casement window operator Truth

A contractor from Omaha, NE says:
45108 on operator body
40574 on single arm
Need one left hand and one right hand.
Arm is 8 1/2 inches from pivot to pivot
Mounting screws arem4 inches apart
User submitted photos of a window operator.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for shopping with SWISCO.com. I have complied a list on the right side of this page that has everything you might need. It's important to note that our operators have a nylon wheel at the end of the arm. It appears you just have a stud, but I wonder if you had a nylon wheel and it broke off. Please confirm, as this is an important detail.
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