You might verify that. rockauto and others show one PN ball joint for drum brakes and another PN for disc brakes. They don't distinguish 9" or 10" drums. I understand that the 2 ball joints have the same spacing, but disc ones have larger bolt holes. The disc ones are much cheaper, so maybe one could add a tube spacer for the smaller bolt, though (as mentioned) you can find drum ones cheap if you search and wait. I know 73+ ball joints have a wider bolt spacing since I got some in error.
