I have a bad seal on a power steering pressure hose as the ring is chewed up. A google search did not help me determine a standard seal material.
I have plenty of nitrile orings (Buna-N) and a few of the green ones for HVAC. I would guess the Nitrile ones should be OK but thought I would check first

Normally, at work I use a Viton oring in nearly everything except for high temperature but I don't have Viton here at home.