The 1/4” tubing ended up being too small for the cupholders to drop all the down flush due to the led strip so I went with 5/16” OD. I found these little things in the hardware isle at Lowe’s to use as a connector.





I crazy glued the ends of tubing together with that little insert in there so it can’t back out, and also used some glue to keep the ring up on the led strip.

To get the wires to fit in the hole I used a “D” shaped file and took off just enough fiberglass in the necessary spot for the cupholder to slide down.

I’m very happy with the results: