I dont have the measurements or angles, but you should be able to scribe the angle using the walls and then just measure the height. Do you have the existing support or the side of the closet? I made new supports - one was exactly the same size as the orginal one(to the right of the entry) and then I made a second one to fit the left of the entry. I made a notch to accomodate the wheel well. Here is a picture for reference. I think I am going to work on my trailer next weekend, I can take measurements for you then if needed.