<div> <h1>DRL Lamp Tube for MERCEDES-BENZ GLS X166 (2015-2019) Fits Left &amp; Right</h1> &lt;p&gt;An OEM-grade daytime running light guide — the clear acrylic strip inside the headlight that turns the LED source into the car's daytime signature line. Over time the original guide yellows, hazes or fractures from constant heat, and the light output looks uneven or dead in sections. This part restores the original finish without replacing the whole lamp.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Features&lt;/strong&gt;&lt;/p&gt;&lt;ul&gt;&lt;li&gt;Optical-grade acrylic moulded to the factory profile&lt;/li&gt;&lt;li&gt;Heat-resistant material suited to long periods inside a sealed lamp&lt;/li&gt;&lt;li&gt;Even light transmission that reproduces the original daytime line&lt;/li&gt;&lt;li&gt;Symmetrical moulding, so one common guide serves either headlight&lt;/li&gt;&lt;/ul&gt;&lt;p&gt;&lt;strong&gt;Fitment &amp;amp; Care&lt;/strong&gt;&lt;/p&gt;&lt;p&gt;The headlight must be opened, the lens separated and the housing resealed, so installation by a qualified technician is recommended. The existing LED is retained and no coding is required. &lt;strong&gt;The same guide fits both the left and the right headlight&lt;/strong&gt; — order two pieces if you are doing the pair. Only routine lens cleaning is needed afterwards.&lt;/p&gt;</div>