Cranks for casement windows

Hi there.  We are buying a home.  The sellers had plantation shutters installed and removed all cranks from the casement windows.  We want them to be operational, and the sellers tossed the parts a decade ago.  The white crank pictured is from the neighbor's home - we asked if they could help us identify what was needed.  We did order one from Amazon just to satisfy the appraiser, but the spline is deep and it didn't quite fit right.  Can you help us?  We need 6 rights and 6 lefts. We would ideally like to keep them on all the time and not have them in the way of the plantation shutters (if possible). If not, I just need to have them sitting on the sill for fresh air and in the case of an emergency for egress. I am both the buyer's real esstate agent, and the buyer... and we're fairly handy.