Headlight Lens W166 GLS LED for Mercedes-Benz GLS-CLASS

Replacement clear polycarbonate headlamp lens for the facelift Mercedes-Benz GLS (X166, 2016–2019) equipped with LED headlamps. Precisely moulded to OE geometry to restore optical clarity and sealing when the original lens is cracked, yellowed or crazed. Sold per side — choose Left or Right.

What this is / isn’t:

• Included: 1× clear outer lens (lens only)..

Key Features:

• OE-Accurate Profile: Correct curvature and bonding flange for a clean seal to X166 GLS LED housings.

• Optical Clarity: UV-stabilised polycarbonate maintains sharp cutoff and the GLS DRL signature.

• Seal-Ready: Smooth perimeter lip for reliable resealing with automotive butyl or PU headlight sealant.

• Cost-Effective: Restore a good headlamp by replacing only the damaged lens.

Compatibility:

• GLS-Class (X166) — 2016–2019 Facelift with LED headlamps
  Not for pre-facelift GL (X166, 2013–2015), not for xenon/halogen variants, and not for newer X167 GLS (2020–Present). Always confirm by VIN and match the lens outline to your lamp.

Related Part Number Families (cross-refs):
Typical complete-lamp families: A166-906-xx-xx (LH) / A166-907-xx-xx (RH); lens subcomponents carry variant-specific suffixes. Verify via VIN and the stamp on your original lens.

What’s Included / Not Included:

• Included: 1× clear headlamp lens only, side-specific.

• Not included: Housing, internal optics/modules, control units, DRL/indicator boards, gaskets, rear covers, or sealant.

Installation Notes (Pro Tips):

• Remove lamp and gently heat the perimeter (low-heat oven or careful heat gun) to soften factory adhesive.

• Separate lens; remove all old butyl/PU and test-fit before bonding.

• Use quality butyl rope (serviceable) or automotive PU (permanent). Clamp/tape evenly while curing.

• Ensure vent ports are clear; replace desiccant if fitted.

• After refit, check headlight aim and do a light-mist leak test to verify seal integrity.

• The beam pattern is set by the internal LED optics — the lens does not change RHD/LHD cutoff.

Why Choose TOParts:
OE-quality Mercedes components focused on fit, clarity, and long-term sealing — trusted by panel shops and GLS specialists across South Africa.

Q&A
Q1: Will a new lens stop condensation?
A1: Usually yes, if the housing is clean, vents are open, and the lens is bonded with the correct sealant.

Q2: Is adhesive included?
A2: No. Use automotive-grade butyl or PU headlight sealant.

Q3: Can this lens fit xenon or halogen GLS lights?
A3: No. This listing is for LED-equipped GLS (X166 facelift) only.

Q4: Which side do I order?
A4: Order the side matching your damaged lamp. On right-hand-drive vehicles, Left = driver, Right = passenger. Verify against your VIN and lens outline.