i have exi 2005 m y left rear shock is makin g noises as some thing is loose inside i went to a mechanic he said the shock gas is leaked now he filled the gas. few days it worked well but now still the same problem as 1 mechanic is saying replace bush now im confused and also from rear its too much low and frm front its up dosent look nice shall i put spacers to lift the car body please kindly advice me thanks.