Ah, I'm very familiar with this helicopter in the real world, and use the version available from the following website in FS2004 quite extensively, but I am unfortunately not aware of one that works with FSX.
Also, I don't actually own FSX, so feel free to try this one, although I suspect you will get gauge issues at the very least.
http://fspainter.helicoptere-avis.com/

You may also want to pose this question on http://www.hovercontrol.com/
Their forums are full of accomplished FS helicopter developers, along with FS helicopter enthusiasts that may be able to more adequately steer you in the right direction for your query.