Will this adaptor kit fit the older NH-D14 140mm fan dual tower cooler?

Yes, the NM-i17xx-MP78 kit is compatible with a wide range of Noctua CPU coolers that use a 78mm mounting pitch. However, you should refer to the detailed compatibility information on the Noctua website to confirm if the NH-D14 cooler is included.

Questions & Answers: Noctua NM-i17xx-MP78 chromax.black, Mounting Kit for Noctua CPU Coolers on Intel LGA1851 and LGA1700 Platform (Black)

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Noctua NM-i17xx-MP78 chromax.black, Mounting Kit for Noctua CPU Coolers on Intel LGA1851 and LGA1700 Platform (Black)

Mounting upgrade kit for Noctua CPU coolers with 78mm mounting pitch (see detailed compatibility information on Noctua website)
Enables the installation of compatible Noctua CPU coolers on Intels LGA1851 and LGA1700 socket for Intel Core and Core Ultra processors
Tailor-made for LGA1851/1700, dedicated one-piece backplate with fixed struts
Outstanding reliability, optimal contact pressure and easy, straightforward installation
chromax.black version with all-black mounting bars and thumb screws, ideal for chromax.black line heatsinks

$16^.88 –