im getting those soon. and im gonna get mine from ebay, so maybe look for the complete set on ebay and email the seller to see if he can just send you the mounting hardware.
Have you tried the stealership? They may go on with nut-serts, the sidesteps from the Jeep do this they can be a pain to use, but another option is inserting a boxend in to the frame with the nut taped to the wrench so it doesn't fall out of the boxed end of the wrench. I honestly don't know if the holes are in the correct spot or not, but there has to be a way the OEM ones get there.
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'08 Ram 1500 QC 4X4 SLT Inferno Red
I have the step bars and only need the brackets that mount under the cab. The stealership said that the brackets aren't sold by themselves and I'm trying to avoid buying a complete set.