I had the same thing happen to me (I have a post here someplace on it). JB weld did not hold. I went to high-quality straight epoxy and has held ever since. Funny, when it happened to me I thought "What are the stinking odds?" Happened to me at stop day two of owning this bike when unused the weight displacement. I would not belive there would be an aftermarket mounting bracket. But, if you still have the ear it can be welded back on if the cast aluminum is the type that allows for welds. Consensus opinion from the group here in response to my post was to replace it.