2004 range rover can just the lense on the head light be changeed without buying the hole assembly
there is a way to do it with a heat knife but you would be better off getting one from a breakers or club
I'd just buy a new assembly, chances of replacing only the lense without there something going wrong during disassembly or the subsequent reassembly are very slim. Loose lenses aren't available so you'd first have to find a used headlight with a pristine lense, might as well just put that in anyways...
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