oooh that might be hard with no hardware lol. is it just the "u" shaped extender and thats it? there is a tab on each side of the extender and you would need the piece that attaches to each side of the bed right behind the tailgate. those tabs slide into these. i will find a pic for ya
if you do have those 2 pieces theres just 4 holes you have to drill into the side of the bed.