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I think that you'd be better off calling Lexus, or see if there's a listing for that bulb in your owners manual. Best of all, pull out the bulb and bring it to an auto supply store.
it says its a 2040 I think but when you look at the 2040 it lkooks nothing like it,I have to replace mine and I took it down to Autozone and couldn't find one that matched
They look like a small verison of the standard 1156 turn signal bulb. I replaced mine with Polarg Xtra White (M-17 I think) versions to match the PIAA puddle Xtreme White puddle lights and dome light.