Based on the way you show your measurements for new ones, mine are as follows.
Screw to screw distance = 3"
Arm length - 13 5/8"
Mine have two screw holes unlike yours that show a third one in the middle of each side.
The only markings are on the bottom as 42 LH
The total width of the base is 4"w x 2 3/4"d and 5/8" high at the center of the base. The manufacturer of the window is unknown
I will need both left and right ones in the same color.
