The sportbrella has a 3/4" sand post that fits perfectly in most everybody's seat pedestals. Cept fer WB's. I put mine in one of the extra bases up front if I'm by myself. If I want it taller, I just add a seat post.
Just got mine the other day and found this to be true. I tie off two of the lines to the back cleats and one to the front seat pedestal. I have a grizzly double seat stand with our seats on.