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Updating this fellas as we have some information we need to adjust.
@Sandie the LS Sport came in 2002; not 2003 as we have listed: http://www.auto-brochures.com/makes/Chevrolet/Impala/Chevrolet_US%20Impala_2002.pdf - It is listed midway down the brochure and it says new for 2002 LS Sport appearance package.
2000-2002 have optional alloys only for the base (confirmed by the brochures as they aren't listed in 2003): https://www.wheelsandcaps.com/p-20005-aluminum-alloy-wheel-rim-16x65-5083.aspx - note these wheels are not offered on LS models.
2001 is the first year for OnStar rear mounted antenna: http://gtcarlot.com/colors/car/35788187-3.html
2003 was the first year for roof mounted XM radio (little round blob is what I call it) by the brochure: http://www.auto-brochures.com/makes/Chevrolet/Impala/Chevrolet_US%20Impala_2003.pdf
2005 rear change all models are now equipped with a smaller rear mounted antenna (not sharkfin) but the style used prior to that.
All for now
@Sandie the LS Sport came in 2002; not 2003 as we have listed: http://www.auto-brochures.com/makes/Chevrolet/Impala/Chevrolet_US%20Impala_2002.pdf - It is listed midway down the brochure and it says new for 2002 LS Sport appearance package.
2000-2002 have optional alloys only for the base (confirmed by the brochures as they aren't listed in 2003): https://www.wheelsandcaps.com/p-20005-aluminum-alloy-wheel-rim-16x65-5083.aspx - note these wheels are not offered on LS models.
2001 is the first year for OnStar rear mounted antenna: http://gtcarlot.com/colors/car/35788187-3.html
2003 was the first year for roof mounted XM radio (little round blob is what I call it) by the brochure: http://www.auto-brochures.com/makes/Chevrolet/Impala/Chevrolet_US%20Impala_2003.pdf
2005 rear change all models are now equipped with a smaller rear mounted antenna (not sharkfin) but the style used prior to that.
All for now