I have a CM 690 II Advanced and the top 140 x 25 mm fan has started making noises and spinning erraticaly. I want to replace the fan, but I'm unsure what I can get as a replacement from coolermaster. It looks like the following 140mm fan is meant for the 690 (not positive for my model though). http://www.coolermaster.com/cooling/case-fan/silent-fan-140mm/ Unfortunately I don't see this model available in the store. Any advice?