I bought a 115 hitch off of ebay last fall, I think I paid a total of $40 (with shipping.) I looked into attaching it this past weekend. It appears that it is suppose to attach to the frame, just behind the gas tank, and the bottom of the bumper. I still have to figure out how to get the nuts on the top side of the frame.

However, I think I remember the hitch had a sticker on it that said "MB 115/116" and that there is a 1500 lb tongue limit, which seemed excessive, but it is pretty heavy duty. If I remember, I will take a picture of it and post it.

Brian