I'm looking for a on-line parts diagram of a 1994 Chevy Silverado.
For newer trucks I go to Group 1 auto parts.
They have a, like factory, parts diagram.
But they only go back to 2000
looking for something like that for older trucks.

 

This has some info https://nemigaparts.com/cat_spares/epc/chevrolet

 

I can't remember if companys like Haynes or Chiltons have those diagrams, despite having the internet now they still can be useful, they might have some stuff too.