Yup, that's exactly them. Didn't think to call them "squish washers"

OK, looks like an easy replacement. No need to pull the valve cover - super!

No leaks at the valve cover gasket, only the squish washers themselves. Most just show a bit of oily dirt accumulation, but one is letting out enough oil to run down the side of the engine and drip a bit on the ground.

Thanks much!

- JimY