I’m using the front runner tent brackets on a pioneer platform. The front runner hardware does not work so I had to find another solution. For my purpose I used 3/8th” bolts into 3/8th” super strut nuts and they fit great. I did have to slightly drill out the hole on the bracket to fit it as they send it with M8 bolts. You can get those strut nuts from the blue or orange box store in 1/4”,3/8”,1/2”. I think for your particular setup you could use 1/4” and get stainless bolts.