Newbie 2008 Cabrio owner here. Planning on towing it in back of my RV, however although there is a base plate with two holes in the front of my Smart, the towing arms and towing frame are missing. I have no idea what to purchase because I don't know what type of plate was installed. All I know is that there are two (non-threaded) holes in my Smart. What arms and A-frame will work?