I thought I got mine through Northern Tool, but I may have ordered them from Agrisupply as KML mentions. Note that the ones sold through Agrisupply are the "economy" model and do not have the bolt on top which I think is to hold them open. Instead they have an L shaped piece of metal that slides over to hold them open. The Agrisupply ones do come with the spreader bar which is additional if you buy them from Pat directly. Mine are the "economy" version and they have worked fine for 4+ years. I did order some of the bent washers from Pats directly and they are great people to work with. I would not worry much either way about the spreader bar. I got it, but it was a pain to use, so I just cut a piece of PVC to length and notched it to hold the arms apart when backing in. Eventually I switched the turnbuckles for telescopic stabilizers which work better and eliminate the need for a spreader bar.