Here is a great thread showing how to mod the Nanjg 105C/Qlite driver to run on 2S Li-ions. Post 1 by DBCstm shows the modifications clearly. Later in the thread, part numbers are listed.
You can easily make the 17mm driver fit the DST by soldering a wire or copper braid around the parameter of the driver.
EDIT: Sorry forgot link. Added above. Thinking about this more, I don't think this would work with an xml. The 7135's would have to burn off a lot of excess voltage. It would be a good option if you went MT-G2 though.