Looks like the lghts have been stripped down and then painted with amber light paint which you used to be able to buy from auto shops years ago (people painted their fog lights with it), not sure you can still buy it though.
i used to see it on more cars in germany, france etc. than in the uk. but as stated above, strip the lights and paint them. personally i think it looks a bit pants, it draws your focus away from the car itself.
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