I need to identify this pin and this plug so I can order more.
RESEARCH: I've pored over Molex.com, Allied Electronics, and here with no success. Please understand, I'm fairly new to electrical engineering and specifically these components. I'm not even sure what to call them. If I knew, it would make finding them a lot easier. I want to know, and I want to do this correctly, and that's why I'm here.
PIN: Critically, unlike nearly every other pin (female pin? pin receptacle?) I can find, this one is seated using the large notch closest to the end. Most I've found use opposing winglets that jut out to secure them within the plug housing, and that won't work here.
PLUG: The current plug has 12 ports in a rectangle layout. The new plugs need to have 4 ports in a square layout. As such, I destroyed one of the unneeded pins to see how it worked, thinking worst-case I can just cut these down to size. Note the style of the clip that secures the whole plug, as well as the small movable arm that holds the pin receptacle in place.
I need these parts to fix my car. It's parked until I figure this out. Also, I'd love to know the proper names for all of these components. Any help would be greatly appreciated.
EDIT: This is going into a headlight ballast on an Audi. It was produced in 2001. Make and model won't help because these aftermarket headlights don't share any internal wiring with their OEM counterparts. The factory ballast was a 12-pin, and that style has been phased out, so now I need a 4-pin plug.
The original 12-pin plug bears the marking L JST. The pins are 1/2" long with a 1/16" opening.
Tons of photos of the pin, plug, and ballast here: https://imgur.com/a/utefuM3
EDIT 2: The "socket contact" as it's called appears to be SSF-21T-P1.4 from JST. That locking mechanism is called a housing lance. Still looking for the connector plug itself, which appears to have come from the JST HL series, which should work but the plug on the new ballast features two raised shafts on sockets 2 and 4 - see the imgur pics.