heater controls

[BILLY N/A]

hi guys,
can someone tell me how many heater knobs there are in the new esprits...the ones with the turny knob type controls ...the same as the elise blower knob
i think these are fitted in the gt3 cars and possibly v8 but not sure
reason for asking is that i am going to run a batch of the knobs off and am looking to get the numbers per car and esprit models correct
thanks for your help