State-of-the-art question

so my father wants to clean up his MX5 NA n standlight in the front. Due to optical improvements (air intakes) there are no ones in it. My question. Is it permitted as a stable simply to clean itself in a poplar fit ne super bright LED and then to use this as standable? Do they have to have a minimum height or can they also at the bottom to the bumper to be needed?