PMC twenty stand spikes


http://imgur.com/l8mCQqX

Hoping someone can help. I have set of PMC twenty stands, but spikes and nuts are missing. As you can see from attached picture, the spikes screw into a bush (which I do have). Any recommendations for replacements?
guerph
Herbies audio lab may have something you can use as an alternative if you can't find the original parts...