squeak on suspension

[boungle1]

just bought a 53 plate bmw x5 done 82000 but there is a terible squeak from suspension on rear

looks like it could be coming from the air suspension unit but not 100% sure any one had a noise like this on theirs

its on both sides

all works ok but squeaks like mad

[andy-mcq]

could be the bushes?

[G4VHD]

bushes usually knock i think, but im no experianced so get them checked.

WD40 :-)

[Greeney2k1]

jack it up and see if theres any wobble