Headlight Lens W166 for Mercedes-Benz GL-CLASS

Replacement clear polycarbonate headlamp lens for the first-generation Mercedes-Benz GL-Class (X166) pre-facelift. Precisely moulded to OE geometry to restore optical clarity and sealing when your 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 edge flange to bond cleanly to GL X166 housings.

• Optical Clarity: UV-stabilised polycarbonate maintains sharp beam cut-off and factory DRL signature.

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

• Cost-Effective: Renew only the damaged lens; keep your working internals.

Compatibility:

• GL-Class (X166) — 2013–2015 Pre-Facelift
  Not for GLS (2016–2019 facelift X166) and not for ML/GLE (W166). Always confirm via VIN and visually match the lens outline to your original.

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 by VIN and the stamp on your existing lens.

What’s Included / Not Included:

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

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

Installation Notes (Pro Tips):

• Remove lamp; 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.

• Beam pattern is set by the internal optics — replacing the lens does not change RHD/LHD cutoff.

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

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

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

Q3: Can this lens fit the GLS facelift (2016–2019)?
A3: No. The facelift GLS uses different lamp tooling. Order the X166 GLS-specific lens.

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