"124-7121004 PART NUMBER 14 IS WELDED TO PART NUMBER 21 MAKING UP PART NUMBER 124-7121004 PC 14 X 21. PART 14 LENGTH IS 6.500 IN, WIDTH IS 3.500 IN, HEIGTH IS 1.750 IN AND HAS A 2.125 DIA HOLE. PART 21 WIDTH IS 2.000 IN, HEIGTH IS .500 IN AND HAS A 1.000 IN DIA HOLE. PART 14 DOG IS HEAT TREATED TO 65000 PSI MIN YIELD STRENGTH AND 95000 PSI MIN TENSIL STRENGTH."