Deciphering old breaker panel wire sizing guidelines

I'm working on a pretty major garage renovation project (long story, probably needs a build thread), and part of that work will be cleaning up the almost 40 years of main service panel "adjusments" to get everything neat, code-compliant, and squared away so that I have utmost confidence in the electrical in the house.

As I've been documenting and prepping for what I want/need to do, I'm a little confused by the way that the specs are provided on the panel label for what size wire the neutral/ground bar holes can accept. I'm nearly certain that the panel is original to the house, built in ~1984. It's a Sylvania "SB20(20-40)C" 200A panel, with 200A service to it. It takes BR-style breakers and all 20 stab spots are notched, meaning it accepts a max of 40 breakers.

What's confusing me is the terminology used on the label for acceptable wiring to the neutral/ground bar. I'm hoping someone might be able to shed some light. Here's a snapshot of the spec from the inside of the panel door:

#0 TO 14 AWG CU <-- obvious

#0 TO 12 AWG AL <-- also obvious

(2 or 3) # 14 AWG CU <-- this too, obvious

(2 or 3) # 12 AWG AL-CU <-- what? Does this mean 2 or 3 #12 Aluminum -or- Copper wires? Are they referring to copper-clad aluminum wire only? Would this accept up to 3 copper 12-wire grounds?

(2 or 3) # 10 AWG AL-CU <-- same as above - 2 or 3 #10 Aluminum -or- Copper? Would this accept up to 3 copper 10-wire grounds?

There are several grounds that need fixing in the busbar, where they twisted together like 5 or 6 grounds and just shoved the whole bundle into one of the large busbar holes. I'm going to separate those out and either correctly pigtail them together or put them in busbar holes correctly. I just need to be sure I'm understanding how many I can land in each bus spot. On the bright side, they didn't double-up any of the neutrals, so at least that's ok.

Thanks!

For full context, here's the entire panel spec sheet:

If in doubt, you could add another ground bus bar. 

SV reX said:

If in doubt, you could add another ground bus bar. 

Had that thought for sure, but parts for that panel are unavailable. AFAIK, putting parts into a panel that aren't specifically for that panel won't meet code. There's room for another bar, but I wouldn't chance that the inspector would fail it.

In reply to CLH :

Why don't you ask him?  Inspectors are humans, and often quite helpful. 

In reply to CLH :

(2 or 3) # 14 AWG CU <-- this too, obvious

(2 or 3) # 12 AWG AL-CU <-- what? Does this mean 2 or 3 #12 Aluminum -or- Copper wires? Are they referring to copper-clad aluminum wire only? Would this accept up to 3 copper 12-wire grounds?

(2 or 3) # 10 AWG AL-CU <-- same as above - 2 or 3 #10 Aluminum -or- Copper? Would this accept up to 3 copper 10-wire grounds?

That should be referring to copper or aluminum wire. Copper clad would be shortened to CCA.

The open circle vs the filled circle symbols are the different sized lugs on the ground bar. 

The larger can hold up to 2 or 3 #10 wires, either copper or aluminum.

Yeah the grounding bar is going to be the Inspectors lowest priority.Would be if I was being a electrical inspector. Most panels for homes built in the 50's, 60's , 70's and 80's more than likely have panels from manufactures that no longer exist. Never had any issues with another brands ground bar installed in a panel. Not bonding properly is going to be more of the issue than the bar and who made it. Most inspectors know this and if asked will be pretty fair and realize you have very few options. Other than doing a whole panel swap to a new panel this is the fun of having a obsolete or discontinued panel .