I have a hayward northstar pump from ~ 2003 ( can't say age for certain ) . Everywhere I go the orings for pump lids are too big. When searching online most don't have measurements and the ones that do are at least an inch in diameter too large. Anyone know a place I could find this ? As per the image attached to this post I believe it needs about a 7 1/4-3/8 diameter. Thanks in advance for any advice !!