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If you're referring to the Sylvania bulb selector, been there done that.
They've never given me wrong info before for any of the other cars I've owned, but some of the part numbers for the sc300 are so blatantly wrong that I'm considering writing in to them :O . They say my dome light is 2040 - a non-existent festoon or any other bulb type number at a bunch of sites I've visited. Supposedly the map lighst are 194's which is also wrong because I tried those and they wouldn't fit...as my original post states, the map lights are a little bigger and much more rounder (fatter?) than 194/168 wedges.
Just as another example, they say my high mount stop light part number is 1156. This is WRONG and I found out the hard way after buying a pair and trying to fit them in...what really goes in there is a 921 size bulb. Partly my fault too though, I should have checked first before going to the auto store I guess
about the dome light. just open up the dome light covering and measure how many mm's your dome light is (length wise) and just type it in yahoo with de3175 as the bulb number. hope that helps..