1992 Plymouth Acclaim, 2.5L with single throttle body injector which leaks gas upward through the larger, top, o-ring. Need to find out the correct Viton o-rings to replace the ones in the car. I went to two stores that had o-rings but what they measured didn't match to anything in their catalogs and physically, nothing matched their stock on hand. Can anyone help me. Local Chrysler dealer says that they can't get them anymore.