That's a 2.8mm connector the whole pin kit is available new and cheap from Amazon.

I did find the new ones I bought to be just ever so slightly looser so if that bothers you a bit of tape to thicken one side makes it a very tight fit. I redid the whole harness with one kit and it includes usually the 2, 3, 4, and 6 pin male/female versions.  The newer ones also have locks on the side to keep them from slipping out. You can also get these kits with wires already attached if you don't feel like repinning an empty shell (bit more money but still cheap).

Example: many styles available:

https://www.amazon.com/Mandark-Car-Electrical-Wire-Connectors/dp/B0DPQK8P7C/ref=sr_1_5?crid=31QGLJI0VK7CO&dib=eyJ2IjoiMSJ9.JXXM7JuswUMfKOEuk8GfFC2FKXdKLCw5vtTcm7RGYMHM9EtyZrNg06y0DiiQphM14wGMVVlARG0OZxofDK1t3bBzJG5eOPtFa7V8FIXon0lHf45Zd9cCJlnh6w2sZwdAnilzQ_tcir6QlhoMG76kcrNIXiS3CpRv20MiVWBkcsqZFQQsbRV86wdgLAwp0vs50nouS28-LXNKvZXGpwZe01Q92SSbpEV9Z70KL_Abx04.1tU03RbUPTchOV0ByDOcHygxiRrZETZJ_HUdDDtRoWw&dib_tag=se&keywords=2.8+mm+automotive+connector&qid=1773447745&sprefix=2.8+mm+automotive%2Caps%2C1634&sr=8-5

https://www.amazon.com/2-8mm-Automotive-Connectors-Pin-Instruments/dp/B07BJGVJRG/ref=sr_1_6?crid=31QGLJI0VK7CO&dib=eyJ2IjoiMSJ9.JXXM7JuswUMfKOEuk8GfFC2FKXdKLCw5vtTcm7RGYMHM9EtyZrNg06y0DiiQphM14wGMVVlARG0OZxofDK1t3bBzJG5eOPtFa7V8FIXon0lHf45Zd9cCJlnh6w2sZwdAnilzQ_tcir6QlhoMG76kcrNIXiS3CpRv20MiVWBkcsqZFQQsbRV86wdgLAwp0vs50nouS28-LXNKvZXGpwZe01Q92SSbpEV9Z70KL_Abx04.1tU03RbUPTchOV0ByDOcHygxiRrZETZJ_HUdDDtRoWw&dib_tag=se&keywords=2.8+mm+automotive+connector&qid=1773447745&sprefix=2.8+mm+automotive%2Caps%2C1634&sr=8-6

Fostin510 10

Posted March 14

Try these guys. Very reasonable prices and shipping.

https://www.vintageconnections.com/

Fostin510 10

Posted March 14