I have that exact cooler, it is pretty simple to adapt it to the 8500. It has this black outter caseing that holds the fan, instead of screws. DONT damage this. remove it. You will find the cooler to be almost a perfect fit except for one capacitor. At that corner, cut the heatsink and round it till it fits around the capacitor. Then replace the black fan retainer thing(very technical vocab lol) and you will find everything fits perfect and it provides a very clean professional look. That corner may take alot of filing/sanding/cutting, but the end result is worth it so be careful and patient.