There you go. I just bought these from Madisound.com. They are currently in stock. They will ship from Madison, Wisconsin. I Next Dayed them, should be here tomorrow. The HDS model # is the same as the XLS. If you go to the specs on that page, you will see that it is a Extra Long Stroke model. What you're looking for.
Madisound is a great place to buy from with incredible service!