Well the top of the tower was based on the X-pro/x2 rear shocktower which sits slightly higher than the original x2c shock tower. They are the bottom holes, the top just made slightly higher for testing purposes although I doubt I will ever use them, At the moment the mounting points on the tower I have fitted to the car are too low so we will raise them up a bit to get the cars geometries back the way they were, Hopefully then the top row of holes will come in to play and you will be able to run standard and move them to top holes to get the car to sit lower.
I am assuming you are talking about the extra mounting holes I have made for the rear turnbuckles? I have made these to get more steering. The car generates loads of rear end grip and I like to have quite a bit of steering so I am usuing a shorter link to achieve this. The next batch of towers will have this incorporated into them to give more rear end turning options
