surrey or hampshire

I knew my time would come soon enough! My car is sagging (mostly the rear) and a Merc indie is saying that it will be £500 + VAT for a second hand replacement, or £1500 for a new part. I've seen the DIY posts, pictures and helpful YouTube video showing the step by step process of repair...

Apologies if this is in the wrong place - I couldn't find an appropriate section for service-related queries. My 3.5yr old C63 is due quite a big service: Service B + air filter + diff oil + auto box oil. i.e. everything on here: ESS Guide for Service: A204077156985/V143MD136500 The quote...