I took 12V new mirrors, transfered the 24V motors over. It was not very easy to remove the mirror from the housing to do it but it can be done. In fact, it was pretty difficult and don't think it was intended to be a serviceable part. It was even harder to snap it back into place like Juan pointed out.
It isn't something I wanted to do again. When I broke one of the new mirrors by hitting it while pulling into my carport and was too close to the brick, I said f-it and just got new manual mirrors. They look better anyways with the black body over the chrome body of the power ones IMHO.
Below is what it looks like when the mirror is removed.
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