twin spark

hi im wondering does the twin spark heads bolt straight on ?
Would that be the CR Machine head you are referring to?
Are you going to buy one?

http://www.shop.crmachine.com/produ...8D9.m1plqscsfapp04?productId=53&categoryId=15

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What are twin spark heads? Is that the plug with 2 electrodes or 3 or 4? Bent over at the end of the plug.
 
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