If that doesn't work, then I would say the other option besides getting a new grill from Mesa would be to take the grill out of the cab, tear out the 1,000 staples that hold the grill to the wooden frame, and try to re-stretch it, re-attaching it with an industrial stapler and a lot of staples. It would suck, but it might work and make the cab look better. Just a thought.
-AJH