I had a pair of Hales once. The grills on the model I had slide straight up. So, grab the bottom and lift towards the ceiling. I'm guessing it's the same for you.
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I replaced the woofer on a Rev III a few years ago.
Tip the speaker on its back and tug gently on the bottom of the fabric until you get the cord out of its slot. Then its easy.
When replacing, just go the opposite direction and end at the bottom.
It's sort of like replacing the screen in a screen window.
I got my woofer from Hales (when they were still open) so I don't know the answer to that part of the question.
Good luck --- I loved my Hales, inefficient as they were.