(This is a revised post from August 03, 2021. Please delete the previous post.)
Quantity for PCX:2pc. I bought a set. After riding for a while, the Single Light did not light up.
When I checked it, it turned out that the contact of Connector was bad.
There is a problem of the Connector on the PCX side, but contact failure does not occur in OEMValve, so it may be the compatibility between Connectors, but I think it will be stable if a more solid Connector is adopted.
If you have the same symptoms, I suggest you recreate Wiring with Bullet Terminal or another Connector.
Looks like you access from European region.
Would you shop at webike.eu.com?

