The red fitting came with my kit originally. So I have that one already. But where'd you get the circled in blue one? Looks like an easy hookup.
The one circled in red came with your shifter? Mine came with a ball attachment.
I used the following parts for the attachment circled in blue from McMaster-Carr:
3798K64 Fully Threaded Rod End Bolt, M8 x 1.25 mm Shank Thread, 50 mm Shank Center Length
2448K47 Easy-Adapt Clevis Rod End, M8 x 1.25mm Shank Thread, 31.75mm Shank Center Length
91409A116 Black-Oxide Steel Male-Female Hex Thread Adapter, M8 x 1.25 mm Thread to M6 x 1 mm Thread
The clevis rod end and the other rod end were too tight to just slide together so I had to file it down a bit and then I had to cut about a half inch off the threads to get it to thread all the way up in the bottom on the shifter.