Ok here are a few more shots I took today. The first just shows a better shot of the D&RGRW casting.(I would also like to mention I was wrong we only have parts for ONE more bench)
The second pic show the one foot casting and you can see the individual small sections just wide enough for one 2-3/4 inch wood slat. Technically you could make these benches as long as you want, and you could place the arm rest's as far apart as you want. So I don't know if ours is at the correct spacing.
You can also see in Ryan's pics that some flat metal has been welded to the feet of the bench.