RockAuto lists the striker as Dorman Part # 38421 with a price of $10.
As I remember, the washer is swaged onto the striker, so the bushing is not replacable. In the past, I have bought a pack of universal bushings and sliced one lengthwise to slip over the striker. Not a great solution though.
You will need a large Torx bit to remove the striker. If I remember right, the same size is also used on the seat belt hardware.