tHIS IS FOR A 12 BOLT CHEVY NOT THE bUICK 10 BOLT 8.2 YOU NEED PART NUMBER 8620N FITS BUICK REARS FROM 1964-1970 1971 1972 WAS 2043 12 BOLT CHEVY CANADIAN CARS WERE THE 8460N GOOD LUCK ON THE PRICE THEY ARE EXPENSIVE AND USUALLY NEED TO BE ORDERED. JIM JD