This Febi Bilstein Thermostat O-Ring (Part Number 10260) is designed to fit Mercedes Benz vehicles. It is a single unit and is described as an OE Matching Quality part. The product is shipped from the UK and the seller guarantees no leaks, offering a replacement if any damages occur. They also provide free UK mainland shipping and offer express shipping options. A 60-day return policy is in place. The seller emphasizes their over 10 years of online experience and offers free expert advice. They advise customers to always check the product's correctness for their vehicle before purchase. This part is also listed as a Thermostat Gasket with cross-references to various other automotive part manufacturers.