Where are LCD power backlight flex cables for late 2015 retina 21.5?

I’ve been placing many calls to iMac parts dealers, fruitlessly.

Apparently nobody sells the tiny cable that connects the LCD screen to the rest of the computer. I’m told it’s called: A1418 LCD Display Screen Inverter Power Backlight Flex Cable

Many exist online for a non-retina iMac. But not for my Retina machine… very odd.

The cable is only about 3 ½” long, and shaped like a “J” One end of it is just beneath the black tape that runs around the LCD. Can anyone advise? I’d be grateful.

This is an iMac Intel 21.5 EMC 2833 (late 2015) 4K display. Retina.

Thanks so much.