Keep you current Heatsink.
Grab a fan any fan of an old CPU or even a SFF case (what I use) that matches the size of the HS
Make sure the screw holes on the fan line up with the Fins on the HS
Re Artic silver or other goo the Heatsink to controller.
Screw fan on
Put fan lead/plug into Motherboard fan header.
The above is what I have on my Perc H200
There is no way of attaching photos' here, don't have photobucket acct either.
But I'm sure you get the idea.
Cheap as chips way to solve heat issue and it looks like it was meant to be there