CPT's, Archive Page Template vs. Archive Item Template

I am still struggling on memorizing all the changes.
I have 4 CPT’s

I want to use a custom side bar for each. Thus I am using a Custom Sideber Widget.

I am struggling in the I am confused on how to create or which to create for each of the CPTs, the Archive Page Template or the Archive Item Template.

Or, am I suppose to create a total of 8 ( 2 x 4 ctps = 8)

Here is some information on one cpt. The slug is / wholsale_carrier/
A sample is here: https://whowriteswhat.com/wholesale_carrier/berkley-companies/

As you can see in the screen shot, the default widget area is ready but, I do not want to use a default wiget, instead I want to use a custom side bar.

So which template do I create so that I can assign a custom sidebar for /wholesale_carrier/ listing in general?

Thank you for your assistance