MC4 Cable Connector Adapter

Good Morning everyone,

I am a purchasing manager at a solar contractor in Texas. One thing that we treat like gold here is the MC4 Male and Female Cable Connector Adapter. Just the metal adapter inserts (see Image below). From my experience, these tin pieces cannot be purchased without buying the whole kit. My goal here is to find someone closer who may sell these pieces in large quantities without the plastic MC4 Connector.

I am currently sourcing these from an eBay seller out of Hong Kong, which can sometimes take up to a month to receive. Another con to this is that these eBay sellers only offer them in small quantities.

Does anyone know of a vendor or distributor that will sell only these metal contact pieces in large quantities?