The following document https://fccid.io/PD99462NG/User-Manual/User-Manual-3671698 , describes the connectors used for antenna interface on AC 9462 wireless adapter:
X.FL; Hirose U.FL-R-SMT mates with cable connector U.FL-LP-066 http://www.farnell.com/datasheets/307202.pdf
I am completely lost with this massive bible size document! I don't have the time to pour through it all.
I have tried U.FL PLUGS and they don't fit, but then again if there are millions of different sizes maybe the one I got was wrong?
And now these are pending: https://www.amazon.co.uk/gp/product/B07J1X9G9Q/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
many thanks for the link in point 3) 'above' .....it says: "A Pair NGFF Antenna of Ipex Mhf4", and that is why I thought of the 20565-001R-13 plug in my original post!
Take Care, have a nice day!
PS: I have placed the NUC in a Akasa Newton JC, OEM (A-NUC42-M1B) fanless case, and that is why I need to replace the antenna coax.
Different cable lengths and different antenna shapes.