Old thread, but just wanted to follow up. The two outer tail light lenses are a direct bolt-on swap from a facelift E55 onto a '98 E300. The two inner ones that go into the trunk lid are not, as @raymond~ mentioned. The inner ones require the lenses to be trimmed (or the trunk lid openings) in order to fit. I instead opted to buy aftermarket retrofit lenses for the inner positions, which were a direct bolt on. The OE outers match surprisingly well with the aftermarket inners and achieved the desired look.

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'98 E300 turbodiesel