Yes, it fits perfectly. I have upgraded a few iMac's to SSD. You need to use SSD Fan Control or Macs Fan Control free apps to control the fan speed via the SSD SMART temp sensor otherwise the HDD fan will run at full speed all the time.
I'm going to try one of the ones with holes for better air circulation as the HDD fan runs a little more than I would like so I'd like to see if better air circulation will help keep the SSD temp down so that the fan stays at low speed.
Answered by: BryceA1