I have a 1985 bronco with a 1988 injected 351w and the fitting on top of the manifold for the heater core is a swivel type and leaks. Anyone know if there is an o ring in the swivel part that can be changed out or any kind of fix for this? I can't seem to find a replacement part. Oh and the fitting also houses a sensor on the top of it if that is helpful. Thanks.