That is not so easy - I need to explain:
This is the page of the German general distributor:
https://www.msa-germany.de/
But to get access to the parts pages you must be a dealer!
That means in other words that all dealers listed at this page;
https://www.strida.de/service/
must be able to order anything from the main distributor - they do have a dealer’s account.
Most German customers do NOT know about this btw…
(Please note: I can see mentioned distributor’s page ONLY via my local dealer!)
Further explanation; as we Austrians do not have our own main distributor we are allowed to buy in Germany.)
That will apply to most European countries.