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Looks like it is just the size of the grills itself notice how the descriptions says,
#01 99-04 Oldsmobile Alero Mesh Grill Kit.
#02 99-04 Oldsmobile Alero Mesh Grill Kit XXL.
#03 99-04 Oldsmobile Alero Mesh Grill Kit XXL FLAT.
and the last one is the same as the second one but is flat and I guess the others are rounded some what?
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