yeah, it sounds like the window regular. The part is $270 from Lexus, but I can get it for $75. Installing it is a real pain in the A$$. Have the dealer do it all. I can get you the part for the same price I paid. it takes about 1.5hrs to install, and should cost you around $150. If your dealer isn't willing to do it for that price, tell them that another dealer stated it takes an hour and half, and to prorate it.
I tried installing it myself, but it was such a pain in the A$$, i took it to the dealer.