My system is missing the rubber feet on the bottom

[Blacklord]

These are VERY hard to find exact replacements for on the production models. The B500 and P500 used a dome type which is much easier to locate. The production models used a pancake type that is the harder to find. The 3M company makes a model with the right shape and approximate size to the original part but nobody carries it anymore - you can try to request "samples" from 3M though.