I've usually found things like these are a dealer only item. Chances are your dealer would have to order it for you.. if that's the case you might want to give St. Charles Isuzu a call. They can mail it to you directly at prices that beat all other dealers (from my experience).

I checked other places on the net and couldn't find a part for you. I was having problems with my unit as well. It may be my control assembly. If you find a place better than the dealer for your part please respond back to this ... and I'll follow your lead!