For 2017-2019 Mercedes GLS166/450/550/63 LED Headlight 166-906-66-03 Left Right


For 2017-2019 Mercedes GLS166/450/550/63 LED Headlight 166-906-66-03 Left Right


We Provide Free Shipping Within the U.S

High Performance And Good Working Condition.

SKU: MB-GLS166 Categories: , ,





  • Brand: Castblock


  • OEM No.:  166-906-66-03  166-906-70-03 166-820-28-00 166-906-65-03  166-906-69-03 166-820-27-00 1669066603 1669067003 1668202800 1669066503 1669066903 1668202700


  • SKU: GLS166          LR4

Free Shipping USA

30 Days Return Guarantee

24-Hour Customer Service


Attention Before Buying


Please check the part number we provided and compare with your own to make sure that our parts will fit your needs, It is the buyer’s responsibility to determine whether the part will fit your application.

    • If you are buying our parts as interchangeable parts, please check the compatibility by yourself. If you are not sure, please contact us and we will check the compatibility for you for free, but the results are for reference only.


    • If you are not sure about part fitment please write us the VIN number of your car and we will check if the part fits specifically your vehicle, free of charge.


  • If the OEM number of our parts is the same as yours, it means that their functionality and compatibility are the same.
    • In most cases, the part which you see pictured is the part that you will receive.But when we have a lot of stock, it may be different.If you are not sure, please contact us and we will provide you with stock photos.Please check carefully that the parts you buy will fit your car.If unsure, please contact us.


    • Item is in good working condition. Buy with confidence.


  • We offer 24-hour online customer service.

If you have a question about any part please contact us before purchasing.If there is a concern or issue that would cause you to want to leave negative feedback, please contact us first and we will do our best to resolve the problem and satisfy the situation.

    • International shipping cost will apply depending on destination location.


    • International shipping We do not include customs clearance fees and taxes.


    • All items are shipped within 3 business day after payment. We will send out our package before 4:30pm Monday through Friday . If you order on weekend, your package will be sent out the next Monday morning.Transportation may be delayed due to corona.


    • We accept local pick up in Santa ana, California. Please note, that you will need to choose local pick up option and find exact address while making the order. (Do not ask us for pick up address in message, duo to eBay policy, we are not allowed to provide any contact info in message system. So if you missed the pick up address, you will have to leave your contacts to us, so that we could reach you and provide you with the info you need. )


  • We may consider delivery within 25miles ONLY if 1) buying in large amount. 2) oversized item.Shipping
Return Policy
    If it is already installed, it cannot be returned
    • If there is a concern or issue that would cause you to want to return the package, please contact us first and we will do our best to resolve the problem and satisfy the situation.


    • Buyer is fully responsible for the shipping cost of the return. Shipping and handling fees are non refundable.We are not liable to pay for any labor fees associated with the installation or removal of any parts we sell.


    • All our parts will come with security seal and other prevention so that we will find out if our parts were opened for any reason. If seen, we won’t accept the return request.If it is really necessary to open the security seal, please contact us and open it with our permission.


  • We proceed refund immediately after getting and checking the returned goods.

We provide 24-hour online customer service. If you encounter any problems during the purchase, please contact us as soon as possible. We will try our best to solve your problems.


If a problem occurs, contact us immediately with any email request.When you satisfied with our product and services please leave us positive feedback.


Additional information


Left driver side, Right Passenger side, L+R Side


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90-day money back guarantee

Free new replacement for one month, free parts replacement for three months.

We offer a full 3 months warranty on all headlights from date of purchase. This warranty covers any defects in workmanship and component failures. If a problem arises with the headlights, send them back and we’ll exchange a new one free for one year and replace parts free for 3 years.

Any headlights or parts sent in by the customer that have been damaged by the customer due to mis-use, improper installation, etc. voids the warranty on the part(s). The customer will be charged for any replacement part(s) and service(s) to repair the damage.

The Workmanship Warranty DOES NOT cover normal wear and tear or hazing to the headlight lens.

While we do our best to ensure that there is a 100% perfect seal between the headlight lens and housing, we cannot guarantee that condensation will not develop. Condensation does not only develop due to standing water in the headlight, but even humidity in the air and differences in temperature and air pressure can cause similar issues. Within the 2 year warranty period, we will re-seal the headlights and ensure all rubber caps are in-tact — free of charge.

Before inquiring about warranty for condensation issues, make sure that:
1) All bulb holders (parking lights, turn signal, etc) and their rubber grommets are in-tact and installed correctly on the light
2) All bulb flanges have caps installed snugly and securely over them
3) There are no rips or tears in the bulb caps or grommets of the bulb holders

Light condensation may develop after installation of the lights after a short period of use. This is due to the moisture in the sealant used between the lens and housing. This condensation is absolutely normal and will dissipate over time. This is NOT due to an improper sealing of the headlight. If condensation is a persistent issue, please contact us to have the lights sent back in for re-sealing.

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 1408 Arrow Hwy , Baldwin Park, CA, 91706
 909-288-3777 or 626-382-3233