I can help with any interior bulb selection/install information when the time comes to do it.

I am actually taking some measurements this weekend when I return to Toronto on the clear corner unit. I will be measuring the width and maximum depth allowable for that unit. The reason being there are several available SMT-LED 194's available that can fit in the clear corner from VLED.com. Some are larger/wider but contain more LED's for more light.

There is also a 6-SMT-LED Flange bulb which would work perfectly well for the corner units with the exception that the bulb socket when in its "locked" position has to have the socket aligned vertically. The flange LED only has LEDs on a flat surface exactly on the same plane as the plug socket.

 

A Standard 194 size 4 LED or 6 LED in the corners is more than sufficient light. I've got a 6 LED bulb in each corner and they are really bright. Anything more and the focus gets drawn to the corners rather than the headlights.