I got 1 from allelectronics and modified it for my slot 1 550e.
I used the retail fan as a backplate and the ends of the heatsink for the retention clips. You'll have to rewire the fan connector,too.
If you can use a drill press,tap,and have a basic understanding of "marking and layout order" you can do it.
As for cooling,it does a good job. Prime95 with other games running,
OC to 825@ 10% more voltage = 37 Cel. Didn't lose any dimm slots(soyoBA6+lll). They are BIG and Heavy! Machined from a solid piece of alum. Worth the $22.50
If you want help e-mail me for the directions,parts ect.