[Merv and Sharon]

Yes Rob, I seem to have a good slab. However, you really only need 4' of slab thickness. The instructions for the 5 bolts on each column are precise to ensure that the columns are parallel and equally spaced. I think I have it right. You also need a decent hammer drill, or hire one. The space between the columns is up to you. It is best to fit one column and then to place the car and see how the yellow arms position under the chassis rails/suspension points for lifting. Then do the other side, using the base plate of the columns as a template. There are suggestions for different car sizes in the instructions. I also tried the other car on there to make sure it fitted to.