Good find, it looks like a match.
The part number they are using (10950816) is a US ordnance number. That part number is from the M151 manual and should be for the round mirror. See here:
https://www.armyjeepparts.com/p-3692...Aq0w4hR4fcYvUz
In fact, if you scroll down on your dealers page, he has the same part number listed for the M151 interior mirror.
His $20 USD price on the mirrors is pretty good. I think his mirror arms may be a little on the high side.