Here is where I got mine. I had trouble finding a kit for the 18" bathroom fitting. So, I made my own:
SUPERNIGHT LED STRIPS and CONNECTORS
1 of SUPERNIGHT (TM) Warm White 5M / 16.4FT 5050 SMD Flexible LED Strip Lights
300 leds or 60led/m LED Light [ASIN: B00ASVC2S4]
1 of SUPERNIGHT (TM) LED Strip light, Non Waterproof LED Flexible Light Strip
12V with 300 SMD LED, 5050 Warm White. 16.4 Foot / 5 Meter. [ASIN: B00E0HBQV6]
Connector 2 conductor
PN: 3528CONNTW
Amico White 10mm Width Silicone Waterproof LED Strip Light End Cap Cover 5 pcs
I did not use the waterproof strips, but so far, about 1 1/2 years , no problem with moisture causing the tape to come loose. I could not believe how cheap the LED rolls where.
guskmg