Telemetry Connection

I have an older 3DR PX4 and am trying to connect the telemetry to my Taranis X9D, the cable seems to need an adapter (between) to go from SPORT on my X8R to the Telem. 1/2 on my FC. the adapter has been difficult to find, except the one in the documentation which im not sure is the correct one. Can

someone explain which adapter i need ? I can put it together once I know the specific part needed for these units to comm. Thanks *See Pics

Ive found one that I think will work, unless anyone has a better choice or direction. Thanks