Inside door handle for sliding door

Im not sure what brand this handle is. There is something that might be W's or M's stamped in it. The stepson, or his friends are too tough on the cast metal nubs which hold the screws holding the handle on. Rest of the handle hardware outside and lock are ok. If you carry this product, can I purchase just the inside handle portion? If you dont carry this, can you tell me who does?

Thank You