Just ran out and took a pic. Two things to note: 1) mine is a little far forward, but my wife is very small and wanted the backrest pretty far forward (she rides with her car seat all the way forward - she's weird) 2) note how I ended up drilling two sets of front holes. Be sure to pay attention where the back supports line up compared to where you want your plate. You may have to make your own holes to clear them and still have support.
I pretty much mangled this rack aesthetically so if you ever plan on getting rid of the top box, plan on buying a new rack. I bought a spare stock one or consider eventually buying one of Phil's racks.