Groove pin for KitchenAid Model 5KSM7990

Hi, I am hoping to get some help in regards to finding the right part for a KitchenAid mixer, Model 5KSM7990.

The mixer is currently used in a busy restaurant kitchen 7-days a week, and the groove pin has become worn and now falls out of the machine. I recently found the appliancepartpros repair video on YouTube and feel confident enough to make the repairs myself. However I need help finding the correct groove pin for the model.