hurd window crank from the late 90's to the early 2000's

Thanks for posting! The Hurd casement window operator you have pictured here looks like it could be replaced with either our 39-253LB Encore Dual Arm Operator or our 39-438B Encore Dual Arm Operator. To confirm which of these is the correct replacement, you'll need to carefully look over the dimensions and design; take note of the differences between each operator. I've included a video tutorial below for reference.

Once you've determined the operator your need, you'll be able to confirm the compatible hardware from the 'related items' section on their respective webpage in the online catalog. I've linked the compatible covers below.