Sorry if this was asked before but wondering can I install 2010+ es350 taillight assembly on a 09 ES350 without any modification?

 

No. 2007 - 2009 are the same. Lexus changed them in 2010 so they won't fit. Lexus did a mild refresh in 2010.
If you look at the many eBay listings, that is how they are grouped.

 

thank you just wanted to realize if they were interchangeable. I know that the 4th gen you can interchange 05-06 es taillights to 02-04 es with minor wire/ harness modification.

 

The tail light housings should be interchangeable. They have the same general shape, only minor details changed within the housing itself for improved aesthetics. I could be wrong though, but I'm 80% confident that they will fit and function as they should.

Same can not be said about the headlight housings. Post facelift lights have an extra curve and a stretched line. That will require some mechanical modification to the bumper and grille in order to fit.

 

can anyone confirm as to whether or not the the taillights can be exchangeable?

 

Call these guys and ask, as they sell used Lexus parts http://www.rancholexusrecycling.com/