I tried the 2765, but the flange diameter was too small. It did not support the bolts properly. The 1705 non-thermal is what I went with, it's closer to o.e. height at 1 1/2" vs. 1 1/4" and the flange diameter is closer to o.e. - if not exact. Although the Hayden units have slots instead of holes, the 1705 still is a better fit IMO. You can look through their catalog online and see the specs for all of their clutches. It's also inexpensive, I think I paid about $30 IIRC.

http://www.haydenauto.com/upload/HaydenAuto/Documents/Cat_Hayden/2007-hayden-fan-clutch.pdf