After looking up the model number, with it not agitating, Appliance Parts Pros website took me right to the correct part. It shipped in a day and a half.
When it arrived, I simply pulled the agitator up, as it is held in place by the plastic fingers. It pulls straight up, and exposes the coupler. Loosen up the bolt with a 7/16” socket. The new one comes with a new bolt; use the new bolt with the new coupling, as it has been redesigned. Snug up the bolt.
Put the agitator back on, and push down until it snaps into place.
Super easy!!