@curtousjim: No, the Townshend Podium does not screw into the holes of ANY loudspeaker or it's bottom plate. The Podium is just a metal plate with Pods bolted onto it. If you want to keep the Reference 5's bottom plate (I would), just install a set of Pods in place of stock spikes. You COULD remove the stock plate and set the now-baseless speaker on the Podium, but why?
The "magic" of the Townshend Seismic products is in the Pod itself, not in the Podium or Platform plate they are bolted onto. The Podium and Platform models are offered for loudspeakers which don't have a bottom plate or base; yours already do. As I said above, I bolted Pods onto the bases Sound Anchors makes for my loudspeaker, in place of the stock spikes.