Hello,
If you are looking to replace the entire casement operator, I'll need to see a photo of the actual operator. I would specifically need to see a photo of the body of the operator as well as the arm(s) and how the operator connects to the bottom of the swinging sash. Otherwise, the cover can be replaced with the 39-107 Truth Hardware Operator Cover and the crank can be replaced with the 39-102 T Handle.
Your casement window lock looks similar in design to either the 38-075 Truth Hardware Low Profile Sash Lock (compatible with the 38-089 Casement Window Keeper) or the 38-170 Casement Lock With 1/2" Post. To determine which of these is the correct replacement for your hardware, you'll need to carefully review and compare the dimensions and design.