if you don't like the cable look, my wagon(67 buick) and 67 el camino
both have some flat ones that fold in half,they even have triangle plates on each end with 3 holes for bolts,(they are chrome also)
by the way did you ever finish the interior on that wagon, I think you
said your wife was helping with the panels, I wish I could show you some pictures of the 55 delivery we done ,it's been getting a few trophies so we are pretty happy.