Hi. I have a '98 2500 Suburban. I can't figure out how the mounting brackets for my Westin running boards attach to the truck. The instructions that came with the mounting kit are worthless. The kit is supposed to be "no drilling required", but I can't find any holes in the frame that match-up with the mounting bracket. Do the brackets attach to something other than the frame? Any pointers from someone who has installed these baords would be appreciated. Pictures of your installed mounting brackets would be a huge bonus. Thanks very much.