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Well last time I did a WP it had 2 round 0-ring's one for the lower rad elbow (about 2.5 inches in diameter) and one for the heater hose fitting (3/4in) then a formed o-ring for the mating surface of the water pump to block. can you describe the flat gasket?
is the flat gasket rubber or some other material? Maybe the flat gasket (what I would call a square cut (cross section view) o-ring) is for the thermostat and the round o-ring is for the inlet.