For the life of me I cannot find out how the straps attach to the 2007 Impala we have. I see they overhand inside the door and (since there was a bar mounted at one time) there are already drilled and tapped holes waiting. But I have no idea what size they are or if there is an additional part, like a spacer. Any photos or advice would be helpful. Can't have it coming off!
Thanks,
Rick
Thanks,
Rick