Thank you for responding. I did try Klipsch right after my original post and Robert Land from Klipsch Product Support replied that they no longer have these. He replied yesterday (Saturday) evening which I found pretty impressive.
However I understand the spikes on KLF 10's are different than the ones on KLF 20's. I didn't ask about the KLF 20's so maybe they still have those.
Do you know if the spikes unscrew on KLF 10's? It looks like they might but I don't want to try too hard. Whoa - I just tried it again and they do unscrew. However the hole is not blind, it goes all the way through to the interior of the speaker. Also it leaves the speaker sitting directly on the bottom surface which I don't like. I will have to make sure the holes are sealed and I want the speakers to stand on some kind of feet. The threads on the spikes do not look like standard threads to me, they seem too coarse. Maybe I can take out a woofer and screw the spikes back into the holes from the inside. That would plug the holes and keep the spikes from getting lost as well. Then I could set the speakers on some furniture sliders or something.
Anyhow now I am just thinking out loud so it must be time to stop.