that said, i'm fairly sure all 05-09 mustangs have the same mirrors and i have also never seen a manual adjusted mirror in this generation, so if you look at local junk yards, ebay, craigslist, etc you are not limited to just gt500 parts.
or, in case you want to change up things, your half way there.
i've seen threads on mustangforums of changing to newer style, smaller mirrors, or agent 47 ones.
if nothing else this shows how to remove, replace the mirrors:
Purchased these parts between August-Sept. 2019.
Removed the following parts from my 2014 GT500. All parts have ~2k miles on them. The SCT Tuner is unmarried and ready to go.
One of the Corsa mufflers has a blemish on it. No idea what happened since I was super careful installing and making...
For sale strut tower brace in great condition.
Took out the cheap looking rivets that hold the center piece in and replaced them with some Allan head fasteners for a nicer look.
$400 plus shipping
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