What he said (sort of). Above photo from this OGR thread. Obviously use an outward facing white surface mount LED instead of green!
Above photo shows a 3-terminal common-anode configuration that was required for the application discussed there. However, if you need a 2-terminal bipolar configuration you could simply straddle the surface mount LED between the 2 terminals of the leaded LED.
If red-white bicolor LEDs are as rare as suggested, at $3.50 each (plus shipping?) wouldn't it be a hoot if that red-white LED is fabricated as above!