A quick learner from Ca says:
August 18, 2014
I'm looking for this hardware. It has a 8 1/4" arm but has 4 screw holes not 3.
Dave from SWISCO responded:
August 19, 2014
It's hard to tell what you have without seeing the operator removed from the window, but see our 39-039 and 39-030 and see if either of these can work for you as a replacement.