I stumbled across a review of the Iwill K266 that had beaucoups photos.
One of the photos was of a Taisol hsf with a caption saying it fit the board with no problem. Sorry I would have posted the link but I couldn't get into anantech at that time and I lost it now. If you want to find it try a search on google.com for "Iwill K266 review" -- that site came up on the first page.
Regarding the Arctic Silver
I didn't order any because I've read some good things about the phase change thermal material that comes on the unit and I plan to use that. On second thought I wish I had ordered it because if you need to remove the hsf from the CPU, I gather that original stuff is not re-useable. Let's say you wanted to connect bridges but before taking the plunge, you wanted to test the CPU. Seems to me, you've gotta then clean off the orginal thermal goop with solvent, then re-apply some thermal paste--might as well be Arctic Silver. So if I had it to do again, I would have order some.
Good luck with your project btw.