Just looked on the rpra site, the information used to be on there, now only gives you the contact details for the home nations? sorry can't help.
But with Belg rings they will only be able to give you the club they were first regestred to, if someone has sold it, given it to someone etc, they dont have any recored of this. well this is what it used to be like unless they have changed the last few years. will keep looking for you