I have a '91 Civic with the D15B2 engine. I'm looking for one of the o-rings that comes with the valve cover gasket set. I need to replace the o-rings in the rocker arm assembly and realized that I'm one short ... and really don't want to buy a whole valve cover gasket set for one o-ring. If anyone has one they'd be willing to part with or suggestions on a suitable replacement .. thanks! Dave