PIAA 500 or 600 (I can't remember) are the correct size, about 4". They look like the stock TRD
's, Yellow with blue tint, but are a lot cheaper.
Or you could pickup a cheap pair from Walmart for about $30 - $40. They fit perfectly...
...Add another $15 bucks for a genuine Toyota fog lamp switch, which also fits perfectly. If you notice in the picture, the window lock button was moved down and put the foglamp switch in its place right next to the security deal. The light on the switch lights-up orange to match the gauges and in the 03's case, the rest of the lights in the car.
side note: the gauge-housing is the 2003 toyota celica carbon fiber dash. the kit doesnt just go on the center console it goes around the gauges as well.
Another idea is to use a brand called, "Eurolite" for this effect...
(Burgh_Mike's Red Celica)