I had a local welding shop weld some square tubing for us to use as seat brackets. We measured a height for the seat and had them use, I believe 1/4 inch flat material welded into square tubing! We then drilled holes to mount the seats and to attach the brackets to the floor. We may have over done the brackets, but I don't think they will come off in an accident! Cost was about $35 4 years ago!