Looking to make LED kits, need some help.

Hey guys. I am looking to make LED kit for car interior lighting. For example replacing the trunk light with 2 LED strips using a Wedge Base connection. Example - This is the type of connection I want so I am looking to get just the base(white part, not LEDs). Where can I get all the parts for this project? I want to get LED strips, bases(many types besides wedge types), crimp connectors to connection wires together, and wire/pin adapter

This is just a small project I want to start doing to get the hang of fabricating stuff. I would want to buy the LED strips in bulk/spool. Also continuing this project would be eventually I want to fabricate circuit board type LEDS for car interiors(dome light, step/courtesy lights), does anyone here have experience in this and could I get some help?

Edit: New Picture