When installing a new heater core and assembling the deluxe heater back together there is a large gasket that goes on first on the firewall , then heater core with a shroud/ flange , my question is do the small round rubber seals go on the core ports before the large funnel goes on or do they go on before the heater hoses go on ? Also " is there a large gasket " that goes on before the large funnel piece goes on the outer heater core flange/shroud ? The assemble manual pictures are not clear on these two questions , thanks Dom