Is its just the screw holes, you can probably just use some of the PET glue that people are using to bond the 5 pieces of the skeleton together to make new hole surrounds in your existing skeleton and then tap the holes. Would be the same amount of work probably.
Don't forget member Larry Hubbert which sells Fiero parts...
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Larry Hubber: There are 2 versions of these units, one is for the Fiero's without the Auxiliary Gauges and the other is for the ones with the Auxiliary Gauges. Also, you need to state what color you need it in. I have both versions in all colors. All are original Fiero parts in excellent shape. If you are interested, please PM me directly on here or by direct e-mail at LHUBBERT2@BRIGHTHOUSE.COM or on Facebook Messenger at LARRY HUBBERT for additional pix and prices. Please include your shipping address as well. Thanks, and have a great day.