1974 Mercedes-Benz 450SL Problems

AS THE SECOND, AND RELATIVELY NEW, OWNER OF A LOW MILEAGE VINTAGE MERCEDES, I HAVE BEEN INFORMED IN JUNE 2017 THAT THERE IS AN OPEN SAFETY RECALL FOR THIS MODEL DUE TO A DESIGN FLAW THAT CAUSES CRACKS IN THE SUBFRAME, LEADING TO A POTENTIAL "CATASTROPHIC FAILURE" OF THE STEERING SYSTEM. I HAVE TAKEN ALL THE STEPS RECOMMENDED, INCLUDING TAKING THE CAR FOR ASSESSMENT AT A MERCEDES DEALER IN JULY OF 2017 TO BE TOLD THAT THIS SPECIFIC CAR DOES HAVE A CRACKED SUBFRAME, YET MERCEDES BENZ US IS REFUSING TO HONOR THE OPEN RECALL CAMPAIGN, SAYING THAT NO PARTS ARE AVAILABLE AND THAT THERE IS NOTHING THEY CAN DO TO OFFER ASSISTANCE. THIS REFUSAL HAS LEFT ME BOTH UNABLE TO DRIVE THE CAR SAFELY, OR TO ETHICALLY SELL IT TO ANOTHER COLLECTOR DUE TO THE HIGH RISK INVOLVED, INCLUDING THE POTENTIAL FULL LOSS OF THE STEERING MECHANISM AS THE WHOLE SUBFRAME HAS BEEN KNOWN TO DROP OUT OF THESE CARS WHILE MOVING. MY UNDERSTANDING IS THAT THE RECALL WAS ISSUED IN DECEMBER OF 1985 WITH THE RECALL NUMBER OF 1985120001- 851211. ANY ASSISTANCE WOULD BE GREATLY APPRECIATED SINCE THE MANUFACTURE IS REFUSING TO SUPPLY A NEW SUBFRAME (AS THEY HAVE BEEN DOING AT AN EARLIER DATE FOR THE SAME MODEL), COVER THE COSTS OF A USED SUBFRAME, OR SUGGEST AN OTHER OPTIONS FOR REPAIR.