I had this same issue twice and replaced the bushing once but it snapped again. After the second time it broke I didn't feel like replacing the bushing was a reliable option. I went to home depot and bought Axle Caps that fit right over the bar that holds the ring on. I have used the shift lever several times off road and have tested it every couple months in the year and half since and it works fine.
Hope this helps
An image of axle caps is attached