1) do i need a centre front?
2) is my car hydractive or non? (2001 Hdi 110 - only the height adjustment lever, no extra buttons), for the 2 fronts and 2 rears
3) do i need a centre rear?
4) guessing i need anti-sink as it has started to drop at rear over night?
I've read all of the methods for changing, so any advice on what i need would be greatly appreciated...
Cheers, Chris