ABOUT 2 YEARS AGO I PURCHASED MY DREAM CAR. 1988 M6 BLACK WITH WHITE INTERIOR. THE CAR IS IN VERY GOOD CONDITION WITH 110,000 MILES. NOW IT'S TIME TO FIX OR REPAIR THE LITTLE THINGS. I HAVE BEEN READING ROUNDEL FOR ABOUT TWO YEARS AND WONDER WHICH IS THE BEST REAR END SUSPENSION REPLACEMENT FOR THE NOTORIOUS FAILING SELF LEVELING SYSTEM. I WOULD PREFER TO REPLACE IT WITH ONE OF THE AFTER MARKET SPRING SYSTEM. WHICH IS THE BEST. OBJECTIVE IS TO MAKE THE CAR PRISTINE OVER THE NEXT FEW YEARS FOR A WEEKEND DRIVER. ANY SUGGESTIONS APPRECIATED.