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The things with the little hooks are the magnets.
Both links go to Amazon:
My clamp is Big Horn 11777 20-InchBand Clamp for Dust Collection Bags, http://tinyurl.com/9u8ho. It works with housings that are a true 20" diameter.
If yours is a little under 20" Grizzly makes Grizzly IndustrialT24733-62" Bag Clamp, http://tinyurl.com/9u8ho
Thanks Frank!