Strange knocking sound from REAR of 993

[malariaman]

My first Porsche has just covered 54K (49 when I bought it last March). A knocking/clonking sound has developed from the back end I assume the could be the bushes or/and shocks, as the off side shock is weeping ever so slightly. Any other ideas what could be wrong and likely cost to change rear shocks?

[Pork_n_Beem]

ARB drop links ?

[rich 36]

Bit of a day for unusual noises on Porsche's today