I worked there for shy of 9 years, pre-Fiat and through Cerberus, the beginning of Fiat and all that.

I was provided with -some- old catalogs but not all of them.

Alot of folks aren't aware---the physical numbers on the parts usually never corresponded to a cataloged/packaged part number.

Many P numbers could be searched for until the end of time in every catalog, and won't be found.

The main tool that I would have used to ID physical numbers (and relate to a packaged/cataloged item)
would be the Performance Engineering Database, which, when I left in 2013,
nobody who was supposed to replace me could seem to figure out how to use anymore

I offered to provide training as a consultant, and oddly never heard from anyone after that.

Last I knew, the Tech Line consisted old buddy Don sitting at home in his underwear (unless he's retired by now. Guess I should check in with him, been awhile).