Is there an easy way to add equally spaced holes

TS 2008-03-13

I need to add equally spaced holes on the inside face of mypart. What is the best method to do so? I have tried the holewizard, but have yet to be successful. Any help is appreciated. Iam not a surfacing guy. LOL

I have attached a picture of the desired locations along with thepart file.

THANKS!!!Solidworks Surfacing