2002 GMC Sierra Denali

I PURCHASED A 2002 GMC SIERRA DENALI IN SEPT 2002 NEW FROM A LOCAL DEALER. I AM THE PRIMARY DRIVER AND DO NOT ABUSE THE VEHICLE. I KEEP ALL THE SERVICE WORK UP ON IT THRU THE SELLING DEALER. THE PROBLEM THAT I HAVE IS THAT THE QUDARSTEER CONTROL MODULE WENT OUT AND I CALLED GM FOR A SERVICE REQUEST. GM SET UP AN APPOINTMENT FOR ME WITH THE SELLING DEALER TO CHECK OUT THE PROBLEM. THE DEALERSHIP CHECKED OUT MY TRUCK AND TOLD ME THAT THE QUDRASTEER MODULE WAS BAD AND NEEDED REPLACED. THEY GOT ON THEIRE COMPUTER AND TRIED TO LOCATE A STEERING MODULE. BELIVE IT OR NOT THERE ISN'T ONE IN THE UNITED STATES. GM DOSEN'T MAKE THEM ANYMORE THEY HAVE BEEN DISCONTUINED. GM PRODUCED THIS TRUCK UNTILL 2005, I WAS UNDER THE IMPRESSION THAT THEY HAD TO SUPPLY PARTS FOR VEHICLES THAT THEY MADE FOR AT LEAST 10 YR'S I AM NOW STUCK WITH A TRUCK WITH 50,285 MILES ON IT AND WAS TOLD BY THE DEALERSHIP SERVICE MANAGER NOT TO DRIVE IT BECAUSE IT WOULD WEAR UOT MY TIRES. THE DEALERSHIP DISABLED THE QUDRASTEER BUT WHEN I DRIVE IT I HAVE TO KEEP THE STEERING WHEEL TURNED TO THE RT ABOUT A QUARTER TURN. IT DRIVES LIKE A VEHICLE WITH A CENTER BOLT BROKEN IN THE REAR LEAF SPRINGS. I WOULD LIKE TO KNOW WHAT MY RECORSE IS WITH GM. I CANNOT PUT ANOTHER REAR END IN IT FROM ANOTHER TRUCK BECAUSE THE DENALI'S REAR END IS 5 1/2" WIDER THAN A RUGULAR PU. I THINK GM SHOULD BE MADE TO START MAKING THE PARTS THAT THESE TRUCK'S NEED. I KNOW THAT I AM NOT THE ONLY PERSON THAT HAS RUN INTO THIS PROBLEM. ALL GM IS DOING FOR ME IS GIVING ME A LIST OF WEB SITES TO LOOK UP AND TRY TO FIND THE PART MYSELF. THERE ARE NONE!!!!!! MSRP ON THE TRUCK WAS $43,000. THE QUDRASTEER OPTION WAS $4,000. I DON'T THINK THAT I SHOULD HAVE TO PARK MY TRUCK BECAUSE GM DOSEN'S WANT TO MAKE THE PART ANYMORE!!!!!! THE QUDRASTEER WENT OUT IN NOVENBER 2008, I STOPPED AT THE POST OFFICE TO CHECK MY MAIL AND WHEN I GOT BACK IN MY TRUCK AND STARTED IT THE SERVICE FOUR WHEEL STEERING LIGHT CAME ON THE DASH. INEED THIS PART!!!!!! *TR