You mean these:
http://www.icydock.com.tw/English/mb882sp-1s-1_frame.html ?
These'll work, I'm currently using them with two 120GB OCZ Vertex SSDs.
Also, I've just moved the metal 'thing' with the disk in it to bay three, so the numbers now say '2-3-1-4' but OSX 'sees' them as '1-2-3-4'.
It'll work fine, though, if you put your SSDs in 2 and 3, you'll have to press the option key while booting to select the right volume, though. (I don't know if you only need to do that the first time or if you need to do it every time...)