RE: Starboard Phantom???
The UJ that you need is Item #5 on the link.
It comes as an assembly, with the Item #8 adapter installed over
a Euro Pin system, but if you are using Chinook SS Euro Pins you may have to do a little "fitting" (i.e. file the bottom of the adapter a little) as the Chinook system uses a different locking slot height than all the std. Euro pins I've got (North/HPL/Epic Gear).
It's really no problem and I found that a slightly modified very old North "Hardcore" Euro Pin adapter was a better way to go.
I just needed to cut a small notch on the upper front to clear the nuts of some of the mast bases I'm using.
Hope this helps,