I have GAIA Is for my MA PL500 speakers. I called IsoacousticIs directly and asked them what I needed for my speakers. They are very nice and will explain exactly what you need for your particular speakers.
Isoacoustics Gaia Speaker Footers
Replacing the spikes in my Soundocity outriggers (Soundocity made me a set of outriggers with threaded holes) with the Isoacoustics Gaia 2 footers has improved the sound of my Merlin VSM speakers. They now sound more open and articulate than with any combination of Z-feet or other spikes, with or without outriggers, on the floor or on a platform, that I've tried. Like the Townshend products the Gaia footers completely decouple the speakers from the floor, allowing them to float. See:
http://www.audiostream.com/content/isoacoustics-gaia-isolation-pucks#IVXH8EtVAjQdwbuj.97
http://www.isoacoustics.com/products/gaia-series/gaia-i/
http://www.audiostream.com/content/isoacoustics-gaia-isolation-pucks#IVXH8EtVAjQdwbuj.97
http://www.isoacoustics.com/products/gaia-series/gaia-i/