Okay, it looks like there are various versions made, some come with the SATA bracket in place, and some don't? (Bit silly considering on MSI's page both the non-DX and DX models stipulate dual HDD)
:- Looks like this is the part here.
If you look at 4:17 on the video, the green thing he removes is the secondary Hard Drive, and if you look closely, the grey SATA bracket he removes it from, is what your model is missing:-The grey SATA mount should be here:Plugs into here, and goes under the heatsink plate:-
Unless of course you planned on replacing your main Hard Drive with the SSD outright.
Obviously my eBay link is simply to show you the part, or similar part to what you seemingly need. Look into it a little more for where to get the part cheaper, and as and where your location requires it. Also ensure that it is the correct part you require, as I'm just guessing based off a quick look. Sorry I couldn't be of further assistance, and I hope we've helped at least a little with your situation.
EDIT:- It might be an idea to e-mail MSI Customer Services and ensure what I'm saying is correct. Also a Mod may want to move this to the Laptops & Notebooks Section
, so you can get better assistance.Edited by EvoBeardy - 1/10/15 at 10:55am