Factory roof rack bolts spacing

So, Ive decided I'm going to try and build my own roof rack similar to a SSO rack. I'm in the process of sourcing all of my parts. Does anybody know the spacing between the factory bolts that hold down the factory racks?

 

i don't have any measurements but if you have roof rails on yours all you have to do is remove the end caps and get tape measure up there or remove the rails and make a templet hope this helps you out

 

Well I knew I could do that but I was hoping somebody may have the info. so I don't have to take it apart until I do the swap.