[therealgeronimo]

You can buy a 3+1 which is what trailers with no brakes will use that will plug in between your two tail lights. There should be a plug inbetween them that it will tap into. The other plug like you are talking about is a 7 plug trailer wire plug that operates trailers with brakes. I don't know if they make an adapter that will plug in like the other one but seems like they should. Check at somewhere like walmart. Thats where I got the last one I had to buy for I truck I used to have.

It should look similar to this: