Power steering pump gasket for cap leaking. The old gasket is all dried up

Bodyperson said
If it was me, I would go to my favorite parts store and buy a roll of cork gasket. My roll is made by victor.
Cut a new gasket. It doesn't have to be perfect. Use something like a antifreeze lid for a pattern or whatever is close to what you need.

Ok the cork will hold up to the fluid but I'm not sure if it will hold up to opening and closing the cap on the pump. I might give it a try though .