Are you referring to replacement LEDs that fit in the existing numberplate lamps?
Im pretty sure the only option available is to change the bulb in the existing unit for a LED one, theres loads on ebay, its the festoon type you need.
Have a look at this, ebay item number is 120665552599, looks like a fair bit of wiring involved though.
i have that on my fr bumper for some months now and i can tell they are really really bright
the resistors i didn't put them cause i saw that the plate light was not can bus so i have no error
Apparently you can get the festoon led bulbs off ebay that are canbus error free.cheaper too.
Just looked on here and the bocanegra ,cupra and fr are the festoon type and the ones on ebay look grand.
Number License Plate LED Xenon White Festoon Light No Canbus Error Warning Bulbs
Has anyone got a picture of these fitted and on....?
I have tried 4 different festoon bulbs in the rear bumper for the numberplate lights.
Various prices from £1 each up to £10 each.
None have yet lasted more than 4 months.
Until I find a reliable version I will be sticking with the OEM bulbs.