We need to located longer linking cords to connect the upper cabinet lights to the lower cabinet lights. Any idea where we can get some?

All you need to do is cut the cord between the lights and add as much wire as you need and wire them up. I use heat shrink over the connectors.

I found a few options on Lowes.com, listed as "GE Cabinet Lighting Cord and Plug"... 48 in. - #30569 60 in. - #30570 120 in. - #30571 Also on GE site.

Hello Valued Customer, thank you for your question. The linking cables are only available on our Jasco website. If you have any further questions, please don’t hesitate to respond or give us a call between the hours of 7:00 AM – 8:00 PM Central Standard Time, Monday thru Friday at 1-800-654-8483, and press option 4. Please refer to your ticket number (533389) if you decide to give us a call. Thank you.