I’ve ordered a Japan OE helmet lock from webike Japan direct, I did not order from their dealer’s page as the lock bracket was generic. An update is that Malaysia’s Tracer comes equipped with these direct from Japan. Apparently Hong Leong is using the JDM models for Malaysia while Singapore model is for Europe Market
If you are keen, these are the part numbers:
4R8-21308-01 Helmet Hanger Assembly
90151-06018 Screw, Countersunk
2SC-2115J-00 Bracket, Helmet Hanger
About $50 a set