Thanks, I was able to get it with a pair of woodscrews. Unfortunately it looks like they changed the crimp on connectors. The older woofer has two different widths, the newer one uses the same width for both and uses different lengths.
While messing the the M40 woofer, I found that something beyond glue is holding the magnet portion on. It looks like it originally had a pair of rivets at the rear of the basket, but one of those rivets failed, and the 2nd is slightly stretched out from the weight of the magnet. It doesn't look like I can reliably repair this unless I can safely remove those rivets. I may need to find a replacement driver.
The newer woofer feels lighter, even though the basket is much thicker and heartier looking. Perhaps the newer one is cast aluminum and the old one is stamped steel maybe? Also don't see a shielding magnet on the M3's woofer.