All plastic and rubber seals will degrade over time, eventually letting in damaging particles to the [part they are there to protect, so a few Euro spent now could save you spending a lot more later for the repair bill of a much more expensive part of your Honda! To get some idea of other parts and consumables you may require, it is always worth checking the 'customers who bought this also ordered these' just below this parts description. It will help you decide exactly what else or not, you may need.