1950 Andersen casement window operators, left and right hand, measurement as shown in photos, #2420 on underside.
My research has shown that Andersen has a replacement part #7073A,B and a channel 0532108 that would also need to be used. They get $211 and $21 respectively for the items. I have 17 of these in my house, many not functioning properly, and I'll figure out something else rather than spend that kind of money. If you know of another companies product that would work, I will consider. Thanks.