I can check tomorrow. I believe I still have all the factory hardware and steps from when I took mine off. That tab with the elongated hole should bolt up to a pre threaded hole on the under body of the Jeep. Then there should be four smaller bolts per side step that bolt to the pinch seam on the rocker. That's for a two door anyway. Not sure of a four door.

 

https://www.quadratec.com/Assets/Installation/75628.pdf

Those are the instructions for installing the steps. From looking at them, it appears that the screws are 10mm and the nuts on the back are 13mm. There are also some clip looking things, too. Not sure, but you'd probably have to buy them online somewhere or from the dealer. I doubt a hardware store would have them.

 

If these are the Sahara style steps, you might want to check out this thread:
http://www.wranglerforum.com/f274/hardware-for-mopar-oe-jk-side-steps-241909.html

I used it to assemble my hardware 'shopping list' after picking up those steps on CL.

 

I asked the dealer, they don't know either! they said it just comes with the steps they have no idea what size it is!

 

I got busy and forgot to look today, sorry about that. Will do tomorrow.

 

Great, thank you:happyyes:

 

I got to it finally today. I believe the bolt size you need is a 10x25mm. Not %100 sure though. It also depends on your year I think. Some years require the use of u nuts with a 10x25mm bolt like the attached pic. Hope this helps. You will need to take a look at the underside of your jeep right behind the welded pinch seam on you rocker. If you see two threaded holes(three for unlimited models) you just need the bolts and no u nuts. If the threaded holes are not present then you will need the u nuts which clip into square cut out holes underneath.