There's nothing superflow and special about these thermostats. Someone just found accidentally an ordinairy thermostat that has a large centre hole and did put it next to a thermostat with the smallest diameter hole he could find. Commercially a smart idea but nothing special.
Just Google thermostat Triumph TR7 to widen the search or more specific Volvo 875796 or Volvo EBC-3576. These have the larger diameter and some Volvo models have even a more wider hole than the superflow. The size diameter is a bit dependant of thermostat manufacturer but you will find enough superflows for the normal price.
Jeroen
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