yes it's just the housing, you get the bulb extra

 

is that part number for the clear housing with the yellow housing inside of it, or the all yellow fog inside and out?

 

there is no yellow housing inside of the clear housing, they are all just one whole unit, nothing to separate

so youeither get the housing with no yellow lens or one with yellow lens

 

Lexus makes two types of Fog lamps for the 2nd Gen GS. They both have a clear front lens. The yellow tinted lamps that come standard on cars equipped with HID headlights (note the HID is for the low beam headlights , not the Fog Lamps) are yellow tinted by virtue of a yellow colored enclosure that surrounds the bulb inside the fog lamp. The light emitting from the bulb is thus filtered yellow and both direct and reflected light shines on the roadway after passing through the clear front lens. The numbers I posted are for the fogs that come standard on cars equipped with HID syle headlights. If that is what you mean by "the clear housing with the yellow housing inside of it," the answer is yes. On the other hand , as far as I know, Lexus does not make a fog lamp that is "all yellow fog inside and out" If you have seen one like that perhaps the owner used one of those tinted films or spray on paints to convert clear fogs to yellow.