This is the current "Newest" intel card that will work - https://ark.intel.com/products/99445/Intel-Wireless-AC-9260
 
The thing you have to look for is this - System Interface Type    -     Wi-Fi(PCIe), BT(USB)
 
The 9560 is an "M.2: CNVio" System Interface Type
 
The M.2 End is similar and you can put the 9560 in the slot but it will not work - do a google search for both 9260 and 9560, look at the images and you will see the difference.
You will also need to find a kit with wires and antenna - they are an easy find with an simple google search
 
Someone REALLY needs to make any one of these threads asking about this a sticky as it seems every other week people are asking and don't seem to know how to use the search function on the forum
 
Here is the Intel list of their wireless products, you can look at the specs you will see that the 9260 is the current best offering
https://ark.intel.com/pro...ntel-Wireless-Products
 
Edit note for antennas. They must have an MHF4 connector on the end that hooks to the card.
Explanation here - https://www.data-alliance.net/mhf4-cables/
Examples can be seen here - https://www.data-alliance.net/mhf4-to-rp-sma-female-cable-1-inch-2-in-3-in-4-in-6-in-8-in-10-in-1-ft-14-in-16-in-18-in-20-inch/
For the X299 Dark I recommend the 2-3" ones
 

I think part of the issues is that (for me at least) the default page filter is show posts from the last 30 days and search sticks to that. When I am looking for a specific thread I have change the filter to 365 days to find what I am looking for

startekselva
Intel Wireless-AC 9260 NGW NGFF  fits perfectly and use the antenna
https://www.aliexpress.co...311.0.0.50f54c4dIjK3ip

Or just buy https://www.ebay.com/itm/264029359167 and knock aliexpress out of the picture

Besides the fact they are from aliexpress aka alibaba the antenna wires in the above post are too long esp for the Dark, you would have to loop the wires and fight to keep them under the IO shield it keeping it = looping = bad for this type of antenna

The cable is short and prefect and if you need cable alone
5 pcs\lot RG178 Extension Cable Straight RP SMA Jack to uFL u.FL IPX IPEX Connector Cable 10cm 15cm 20cm 25cm 30cm 50cm
https://s.click.aliexpress.com/e/bU8BtG7O

sorry but my web filter doesn't allow me to click those links, marked as bad

I have a VPN and I use pi hole. I am not going to get into an debate and I am not going to click on any more ali express junk. The whole reason I never gave an actual link for purchase and just told people what to look for is that they can use whatever is easiest for them where they live and where they are comfortable buying from instead of a knockoff site