First I had to remove the old heatsink. It popped off easily with two clips.
Underneath I discovered a thermal pad, which is not ideal for heat transfer
purposes. I had borrowed some nail polish remover (acetone) from a girl in halls
to clean it off as I left my cleaner at home :)
And here's the bracket that goes on the back of the card:
It's got nice rubber shock absorbers so you can get it fairly
tight on and not worry about it vibrating loose or shorting out your card.