I used these to connect to 4x6" LED lights to the custom harness I make for customers.  Bend the locking tab on the 7.6mm connector to lock into the adapter.

Parts required:

7.6 mm female spade connector (some list as a 7.8)

wire and terminating ends as required for the other side

Printed 0.2mm, 15% gyroid infill but this won't really matter, 3 perimeters, PLA as the wiring shouldn't get too hot with LEDs. If it will be more exposed consider a material not as susceptible to moisture and heat.