What iMacs are compatible with Airport Extreme 802.11g?

I am switching my question from the PPC iMac forum to here, hoping I can find the answers.  I am trying to figure out which used 20" iMac will work for me, and a key element is that I need to limit the wireless to the 802.11g spec.
(1) do all Intel-based iMacs have built-in wireless, and
(2) when did they go to the "n" spec (which I do NOT want!), and
(3) whether it is possible to disable built-in wireless in an iMac and add a card to substitute the "g" spec. (I doubt that is possible, but I'm sure somebody here knows the answer.)
thank you!

Yes
802.11n first appeared in late 2006 model iMacs.
Yes, you could use a USB dongle instead if you so choose, but why? You could just as easily limit this capability in your router.

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