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You would also be well advised to use the standard NGK Platinum plugs, the part numbers of which DIDDY has already specified. If you get tempted to fit cheaper alternatives then you may end up disappointed. The NGK Platinum plugs last 60k miles so it's a worthwhile long term investment :)
 

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If they are for your 146 Ti they are 10mm (BKR6EKPA) and 14mm (PMR7A):thumbs:
Correct p/n, but the wrong way round.
BKR6EKPA are 14mm thread
PMR7A are 10mm thread

Both have a 16mm (5/8") hex.
 
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