OEM Nerf Bars/Running Bars

I just purchased a 02 Sport Trac without the nerf bars and I am wanting to buy the OEM Nerf Bars, used. Most bars sold used do not have the mounting hardware. I have called several Ford Dealer's for the hardware and they do not sell just the hardware. Does anyone know what size the mounting hardware (nuts and bolts) I need to use to mount them? or is it only dealer avaliable with the purchase of the new nerf bars?

Check this ebay seller's store. They have lots of things for Explorers. http://stores.ebay.com/BONES-ENTERPRISES_W0QQsspagenameZl2QQtZkm

Cool stuff at the store thanks for the help! Well, I have purchased the OEM Nerf Bars from Ebay w/o the hardware but I found out what is needed to mount the damn things. You need 12 "M8" speed clips and 18 "M8" body bolts, M8 bolts and speed clips can be found at your local auto parts store Autozone, Oreily's etc for anybody else with this dilema.