1964 Dart manual steering pitman arm shaft seal.

I have a printed copy of original Chrysler parts catalog from March 1965 and it gives pitman arm shaft seal (steering gear out put shaft) a part code 19-19-35 and a part number 2126 956. The part catalog loaded from mymopar.com in pdf mode seems to be the same from march 1965 and it gives the same part code 19-19-35 BUT it gives different part number 2127 154. Which one is right? Catalogs claim to be both same versions "March 15, 1965 supersedes March 16, 1964" but still in my catalog info is on page 19-22 and in pdf it is in page 19-6. And my catalog has part codes 19-19-26,30,32 that are missing in pdf and my catalog is missing codes 19-19-25,28.