Turn Signals - '41 Pickup?

[Anteek29]

I want to install turn signals on my truck (6 volt). I have the switch, flasher and LED tail lights but not sure how to address the fronts. A fellow Barner suggested using the existing parking lights by putting in larger, brighter bulbs. If so, what bulb number would suit? Is there a Halogen or LED bulb that might also work? Guess I am trying to avoid mounting extra lights on the front of the truck (like fog style ones).

What have the rest of you done?