Originally Posted by Bullit79

Link for 7443 socket: 7440 7443 wy21w led bulb tail turn signal parking brake backup lights

Scroll to the bottom for the socket.

Also, here's a post from another thread that gives a step-by-step on modifying and installing a dual filament bulb.

Link: Rear Fog Light-Help!!!

I followed that post and it works just as advertised. Actually, I got an extra socket I modified if you're interested. Pics and info are in the post linked below. PM me if you're interested.

Modified 7443 socket to fit fog lamp: Freebies Thread