It's definitely a different look. Don't worry about the bolt holes though, you should be more concerned with the width of the spoiler (wing as you call it). I'm not sure if the Impala and Alero have the same width on the trunk, but I do know that the styles are different, and the Impala's spoiler looks more formal compared to the Grand Am/Alero, which seems more of an afterthought.
You want the spoiler to be at the end of the trunk edges, similar to how the stock one is. The bolting is just that... a bolt hole.
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2̶0̶0̶3̶ ̶P̶o̶n̶t̶i̶a̶c̶ ̶G̶r̶a̶n̶d̶ ̶A̶m̶
1994 Olds Cutlass Supreme
2̶0̶0̶2̶ ̶C̶h̶e̶v̶r̶o̶l̶e̶t̶ ̶C̶a̶m̶a̶r̶o̶
1996 Infiniti G20
1993 Chevrolet Lumina Z34
1989 Buick Regal Limited
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