looking for Hope replacement crank and arm

Greetings: I need to replace four Hope window cranks and arms (the teeth are stripped). The original part number is R. H. 5564. The screw holes are 4 1/8" apart. So far, so good, right -- because that would seem to match up with your 39-354.

But there are two issues: First, the length of the arm is not 9" but 14". Second the disk at the end of the arm that slides into the bracket has a diameter of 10/16", not 9/16".

So I have three questions: 1) Do you have a replacement model with a 14" arm? 2) If I use the 9" arm, does it just mean that my window won't open as widely but will otherwise still be usable? 3) is the 1/16" difference in diameter a nonstarter?

For $25, I'm willing to experiment, but wanted to hear what you folks had to say first. Thanks very much.

for TOM:

See pix of Hope's hardware that I'm trying to replace. thanks, jg