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I believe you can but it's not a simple plug and play like it is with the noted packages. You have to splice some wires to do it. If you search enough, you'll find a thread on it.
"*For 2006 model years - Illuminated Door Sill upgrade only applies to IS models equipped with Sport or Luxury Package.
*2010-2011 IS models are not plug and play (inc 2008 IS-F)."