Andy - I virtually started this topic as these were the questions you were asking in Pete's buggy thread
If I were you I would look at either the RE arms or getting something else made up with a similar design.
It is hard to go past the RE units if you can get them for a decent price
And we have seen they can flex very well indeed on JPmarks jeep on the jamboree ramp.
So they can flex heaps and then you have the luxury of tuning the setup to provide the flex you need/want.
Take a good look at the 2.5" currie JJ that has the threaded stud welded on already.
http://www.currieenterprises.com/ces...t.aspx?id=1265
Then a tube insert and jam nut.
Other end can be any rubber bushing you find for a decent price.
You can even re-use ones out of stock TJ arms.
If you do find a local source for similar joints to the large RE or 2.5" currie then let everyone else know.
It would be great If you can share more info about what you end up building.
cheers
z