I'm not sure what you are asking.
There are no aftermarket grills for the 2002 Galant and due to the new front bumper design, you cannot use a grill from a 99-01 Galant unless you get a front bumper from a 99-01 or some how modify your 2002 front bumper.
As far as putting mesh behind the stock 2002 grill pieces, you shouldn't have any problems with that.
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