I just tried Google myself and you're right, hard to tell from the pictures and can't find a spec sheet. Maybe someone with an older pitbull will chime in and get you going.I've looked at all the Google Images I could find. But, there are things I need to know that most photos don't show. For example: someone put a raked tree on an already raked frame. The total rake looks to be +45°. The bottom rails are no longer level with the ground. The front of the frame rails are 1" lower than the back. With some good pics, of the original set up, I may be able to work out (on paper) what needs to be done...