the mirror has a rubber lining over the edge that has to be removed. otherwise, you're right, it would melt. the foam covered weight is not attached to anything so it comes right out when you remove the mirror. i really don't use the o.e.m. mirrors since i like teardrop shaped ones instead. but it shape of the housing didn't change, so i don't think it will make a noticeable difference.
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I have no idea what you're talking about.... 
..so here's a bunny with a pancake on its head.
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