Thank you everyone. I consulted a technician who informed me that Bilstein is a reputable company offering original equipment parts, available for around £40 shipped, compared to the dealer's pricing of £120 apiece. I would not mind earning 20-30% extra and obtaining an MB portion, but it is excessive. Notably, the Bilstein B3 37_172350 is pricier in retail stores; nevertheless, I discovered it available at their official branch or on autodoc.uk for around £30, excluding shipping charges.
I researched extensively and found that Bilstein is regarded as a luxury brand, and sometimes, Mercedes-Benz sources components from them, rebranding and selling them.
What are your opinions on autism? Is the firm reputable?