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Car Insurance
Ask Federale assurance, Partners assurance, Ethias, Touring, Axa. There are plenty of them. They might not cover for assistance as your car is too old but for basic cover civil responsibility(RC) I think all of them will cover you
You can also ask an insurance broker to check the various options available.
https://brocom.be/fr/brocom/le-role-de-brocom/brocom-en-bref/courtiers