Oringing and fire ringing are not the same.
Oringing uses the stock gasket and squeezes the wire oring into the firering in the stock gasket.
A firering replaces the firering in the stock gasket which requires a gasket with the ring removed.
The firering setup is showing to be a better system but does require more work.
I would be glad to visit with you, give me a call.
Michael @ HotRodDiesels.com
Also Chris at Relentless is very good at what we do, don't hesitate to call him.