I bought mine used from someone who had changed them to put in a turn signal kit. If you want new, here are the OEM lights https://can-am-shop.brp.com/off-road/us/en/715006896-led-signature-lights.html
There are also some aftermarket ones with white and amber combinations showing up on searches...
My dealer says his personal Defender also does it and he knows some others that do it too, but not all. He said it’s some type of harmonic in the roll bar down to the frame. We are gonna try a couple of things when I take it in for some accessories to be added. Will advise.