just get the dual bulb with the amber insert. then wire one of th bulb with the parking light and the other one in the amber insert use as turn signal. by doing so you can have the corners on with the city lights, parking lights and have additional turn signal at the corner lamp.
edit::
also the single bulb jdm corners uses a higher watt bulb. if you keep this on it will melt the amber insert in the lamp and eventually melt part of the corner lamp. ask me, i know /ubbthreads/images/graemlins/bawling.gif