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Too bad the Sewell online catalog is no more. But you could call any dealership parts department and ask whether there are different part numbers for 04 vs 06.
As for an online parts breakdown...http://www.japan-parts.eu/lexus/gr/2...1250_004_/body
It takes a while to navigate but some interesting stuff for all the Toyota/Lexus models from all markets and specifies left or right hand drive models too.