Is this the right case for my IWC movement?

Hi, I purchased a large lot of vintage watch parts and found a IWC movement and dial. Its the 8521 movement. I would like to find a case and make it a complete watch. I have found this case but i'm not sure if my movement would fit in it. He said he tried a 853 movement. Are all '85' series movements the same?

Also where would be a good place to find a case if this is the wrong one?

Any help is appreciated.

Thanks, Tyler

http://www.ebay.com/itm/271931629029?_trksid=p2055119.m1438.l2649&ssPageName=STRK:MEBIDX:IT