This is currently a concern of mine so it was nice to find this recent(ish) thread, thanks for all the info! Mine sounds like this over mildly rough tarmac:
https://www.youtube.com/watch?v=4T1snelKf2Y&feature=youtu.be
I would like to find or create a part number list for rubber replacements, though the OEM parts are available it seems like they're insanely expensive from a dealer, I'm sure Febi must have some alternatives.