In fact, it can be changed, but some old masters will consider the time cost. Except for acquaintances, they won't change it for you, because it takes a lot of time and the cost is not low. It's a thankless job. If you can, you can go to regular auto repair shops in some big cities. If you have to repair them, you can pay a little more. Of course, the original is the best. Master should help you fix it.