N16 spark plugs

Can someone give advice on the spark plug reach for the N16 engine.The ones fitted have a 26mm reach but the Bosch Fr7 dcx+ suggested by a local supplier as a replacement have a 19 mm reach.

Consulted the Haynes manual and checked out the suggested replacements but cannot find a definitive answer on thread reach.

I would imagine the 26mm is the one to go for as they have been fitted for the past year without issue but it would be good to know for certain.

Cheers
 
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