If you have some dead laptop, smartphone or desktop monitor screen with led backlight, then you could find there something similar. In my experience all LEDs were of the same form factor. If you can make a picture and write dimensions, I could check if I have something similar. I also can send a complete flex cable with such LEDs salvaged from laptop/smartphone or tablet LCD at the expense of shipping.
Actually I have backlight salvaged from sony tablet with flex marked with YOUNGLighting. Doesn't mean that leds are of the exactly same light output though.