Star Sound made very good ones. Not sure that they are still around I think they added Technology to their name.
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Yes, 1/4-20 is Mirage's thread diameter and pitch. You should be able to find aftermarket spikes or cones in that thread size, such as at Oregondv, which also sells the Soundocity outriggers if you really want some stability out of these narrow footprint speakers, especially on plush carpet.