Truth EntryGard 20810 operator - need replacement identification

Hi,
I’m trying to identify the correct replacement hardware for this casement window. The existing operator is marked Truth EntryGard, and one of the arms is stamped 20810.
The crank stopped working and the crank/worm-gear shaft pulled completely out of the operator. Several broken retaining/bushing pieces also came out, which are shown in the attached photos.
I’ve attached photos showing the operator arms and markings, the 20810 stamp, the failed shaft, and the broken pieces.
Could you please identify the correct replacement operator, including the proper handing? If you need any specific arm or mounting measurements to confirm the part, please let me know what to measure.
Thank you!