The front running lights DO work. I am pretty sure they are the right bulbs. They were working until recently. My sister was driving the truck and got pulled over for having no taillights OR brake lights, but the hazards and blinkers worked fine. I took off the housing and it looked like the bulb wires had been cut for some reason. Don't know why...just like that when I got it. There's a green, a black and a black with yellow stripe wire coming from both bulbs. On both of them, the green (power) and black (ground) wires were cut and held together with butt connectors, but the black and yellow (signal wire?) was intact(this is on the amber bulb, the clear reverse one is fine and works properly). On one side the butt connectors had come undone, so I took them off and soldered the connection back together and then soldered the other side, just to get rid of the connectors. At that point I was able to get the brake lights to come on, but still no running lights.
The bulbs are dual filament, so I guess that would mean that either there's a separate ground or power for the running light filament (black and yellow wire maybe?) or else there is a separate fuse.
Thanks for all the help guys! Never would have thought it could have seperate grounds or fuses.