floor spikes

Anyone know if they sell aftermarket floor spikes or do i have to go back to the manufacturer? I need spikes for my wharfedale diamond and dynaudio 1.8 speakers.
There are numerous companies that do after market cones. Like every thing in audio there are many sizes and qualities.

To name a few Michael Green roomtunes, Black diamond racing,
Poly crystal, and Orchard Bay Acoustic.

Thanks stewart