Windows 7: Acer 7750G - 9657l laptop , Extra drive slot.

So I purchased one of the aforementioned laptop awhile ago and today when I took the back off to be nosey I found there is another slot for a second hdd. I had a spare one sitting around so put it in and booted the lappy up and it happily found it.
Problem is there is no way the cover is going to go back on due to the placement of the second hdd slot. I presume there is a different cover that perhaps came with a different model number ??.
Who would be the best to contact to find out, I tried acer support but the guy had no idea what so ever.