AC - low pressure rubber seal ring... where can I buy a replacement?

I had recharged my ac and sat it wasnt cooling well so I took aditional reading and it was low already. I recharged and also used some sealer/conditioner and I noticed the rubber ring around the ac valve was really worn and "may" need replacing.

Where can I buy one of these little rubber rings?

thanks

When it comes to stuff like this, I always recommend the GM parts. They may cost a little more but I think it is worth it in the long run. Normally not too much more than the VatoZone special.

Plus...LS1tech/LS1 has a couple stealerships as sponsors. And they tend to be pretty good about charging just a bit over cost instead of the normal 2-3x cost.