For WY, you need one that meets the PCI Express Mini Card interface specification. This is the model that you want: Amazon.com: Intel Dual-Band Wireless-AC 7260.
The 7265 and 8260 models both utilize the M.2 (NGFF) interface, which is not supported in the WY NUCs.
This is the list of tested peripherals Wi-Fi and Wi-Fi/ Bluetooth for Intel® NUC Boards D34010WY/D54250WY; the use of any wireless adapter other than those listed here is not supported by Intel and may violate regulatory compliance requirements for your region.
Wi-Fi Intel Intel® Centrino® Advanced-N 6205 Intel Intel® Centrino® Wireless-N 2200 Intel Dual Band Wireless-N 7260NB Wi-Fi/Bluetooth technology Intel Intel® Centrino® Wireless-N 6235 Intel Intel® Centrino® Wireless-N 2230 Intel Intel® Dual Band Wireless-AC 7260 7260 Intel Dual Band Wireless-N 7260AN Intel Wireless-N 7260BN
You can find this information in the link below:
See Wireless Regulatory Information for more details on wireless compliance.
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