Don't know if Cummins supports your year engine BUT
You could try to register with Cummins Quickserve,
https://quickserve.cummins.com/info/index.html
once registered you put you engine SN in. From there you can look for parts. In most cases the parts are shown on a drawing as to where they are located.
There is lots of info on the site, I down loaded a complete maintenance manual for my engine along with a bunch of various high failure parts pages.