That application actually uses a removable type bullet connector. It looks like a barrel with hole in the end and a slit along the side.
You feed the wire through and out the front of the bullet and lock the wire into the slit to hold it in place as you press it into the holder in the light.
Yes, you can use a true bullet connector, but as has been pointed out, you'll need the special crimp tool OR you buy the solder on bullet connector.
I have and can send you the little removable connector bullet if you'd like. Since your in Dallas, look up Kip Motors and he can hook you up with what you need.