If your machine's gotten louder over time, or you feel more shake through the deck than you used to, the mounts and bumpers are almost always the reason. Rubber doesn't last forever, and once it's past its working life, all the vibration it was supposed to absorb goes somewhere else.
This is the genuine Nilfisk Advance OEM BUMPER-RUBBER, part number 56394365, brand new in the box. Replacing mounts is cheap maintenance that heads off expensive downstream problems — cracked frame welds, loose panels, worn bearings on nearby shafts.
Not sure this is the right mount for your machine? Send us the model and serial and we'll confirm.