Chicco Polly harness part has split and now it won't secure properly

[yankiedoodledandy]

I've done a cursory search online for spare parts and sent a query to Chicco about a spare part. Does anyone know anywhere where you can buy spare harness parts? Its the plastic bit on the waist strap that slots and clicks into the centre part of the harness. Now it will slot in but won't click into place so the child isn't secure. Thanks