Packing Washer - American Brand Kitchen Faucet

[plumbguff]

Anyone know where to obtain a packing washer for Standard (American Standard?) brand kitchen (25-50 years old) faucet?
See attached images of partially disassebled faucet and close up of left hand valve.

The left side handle was leaking water. I disassembled, unfroze the washer and some of the packing washer crumbled off, i cleaned everything up, reassembled, and water leak from left handle is considerably worse now.

I know of two options:
A) replace the packing washer
B) replace the faucet

I'm having no luck locating a replacement packing washer online. Maybe i just don't know the magic keywords to search for. O.D. appears to be close to 1".
Replacing the faucet looks to be a large PIA, as the retaining nuts under the sink do not want to come loose, and likely will have to either pull the sink for more leverage, or drill/break the retaining nuts from underneath.

Hoping someone has some idea where i could get a replacement packing washer. Would make life much easier to replace the packing washer.

Bob

 

[plumbguff]

3/4" outside diameter, beveled is the closest match i'm seeing:
https://www.mcmaster.com/plumbing-washers/faucet-washers-7/
The brass/copper washer that rests against the packing washer is 7/8" O.D. The brass/copper wash rests neatly in the lip of the female part of faucet threads. The packing washer that needs replaced appears to be more like 15/16" or 31/32" diameter.

Bob

 

[breplum]

We try to keep the existing packing and add appropriate piece of graaphite packing rope along with plumber's waterproof grease.
Many Ace hardware stores have bonnet/dome packing in various sizes.