Just posted on ebay a set of Gibraltar 21" X 3/8" or 9.5mm Floor Tom Legs with the floating rubber feet. Check them out.

https://www.ebay.com/itm/Gibraltar-21-X-3-8-or-9-5mm-Floor-Tom-Legs-with-Floating-Rubber-Feet/264433373088?hash=item3d91750fa0:g:aqoAAOSwkpxc8vvl