Swapping out HD with SSD in mid 2010 iMac

I just purchased a Crucial M500 500GB SSD to upgrade my iMac (mid 2010). I am going to swap out the original drive, NOT replace the CD-ROM. Two questions, will the following OWC kit work?

http://eshop.macsales.com/item/Other%20World%20Computing/DIYIM21SSD11/

It claims it only supports 2011. Seems like it should work, unless they changed screw sizes.

Second, I believe I am going to need a 3.5" to 2.5" adapater, but can't seem to find one that is guranteed to work with the iMac. Any suggestions?