? about rim mounting gaurds.......

Does anyone know where I could find the plastic 'rings' that are around the lip of a rim (that you sometimes get depending on brand) when you buy them new. I've used the plastic covers that go on the arm of the tire machine and don't much care for them. I want to get a few different sizes of the rings so I can mount/dismount bigger rims without any chance of damaging them.......

Any help is much appreciated!!!


Thanks