The metal washer idea works well. but it will find every poorly torqued down bolt and vibrate them loose.

I removed mine and replaced it with the Avid rubber mounts.

When I made mine. I just put the giant washers from TSC.. on the oem mounts as they were. The inner sleeve protruded thru the holes in the washer. I do have a 1g awd oem mount with the stock rubber in it, you can have for for cost of shipping. You can use that to make sure its lined up.