Quick update, I went ahead and bought it anyway, it does fit but with mods.
You'll have to ditch the slotload drive, and use the adapter for 2.5 inch drives and mount your HDD in the 3.5 slot using the adapter. The reason is that the SATA cable will foul the heatsink, so it needs to be raised to sit above the top of the heatsink. Depending on the location of your 20 pin plug you might also have to hack off some of your disk mounting tray so that it doesn't rub on the wires coming out of the 20 pin. It's approx 40mm from the bottom of the PCB to the top of the heatsink.