I had a base plate made by a local welding shop for my roadmaster tow bar. The base is removable with 4 bolts. It mount to the tow brackets that are part of the AVE bumper. Those brakets mount with 6 half inch bolts. The base plate mounts to the AVE brackets with a one inch bolt and a 5/8 bolt on each side. If interested I take a photo of the base plate and E-mail you the picture. Roadmaster base plates cost more than I paid for a very strong base plate.