Snapped the o-ring in your pro scooter headset?
Then grab yourself a fresh one of the two size-options available here. One for IHC compression and one for the other types of compression.
Measurements:
<li>S: <li>30mm outer diameter</li> <li>26mm inner diameter</li> <li>2mm thickness</li> </li> <li>L: <li>32mm outer diameter</li> <li>28mm inner diameter</li> <li>2mm thickness</li> </li>