The file MT60- 1B you mentioned is broken. Is it a machine?
1, you can go directly to the manufacturer to see if there are any accessories (as for the phone number of the manufacturer, you can check it by Baidu).
2, that is, you can take your broken gear to that kind of parts processing enterprise to make a new one according to the size.
I hope my answer can help you, thank you for your adoption! ! !