A fastening arrangement attaches a row unit to the tool bar of an agricultural implement. The fastening arrangement includes an elongated flat operatively connected to the tool bar. The elongated flat has a leading surface lying in a first plane nonadjacent to a second plane which includes a trailing surface of the tool bar. A head bracket is adapted to receive a row unit. The head bracket has an aperture therethough and is supportable on the elongated flat. A clamping nut and bolt combination is configured to fasten the head bracket to the elongated flat. The clamping nut and bolt combination includes a bolt adapted to pass through the aperture of the head bracket and engage the clamping nut in a mating relationship.