Westfield bring their shock straight off the top of the rear hub
The thread thing makes me nervous because a friend of mine built a v8 rover westie and the top rose joint sheered of. Westfields answer was to send him a better quality unit. Kin great when it could have killed him.I was in that car at break neck speeds the day before.It was not the one with the arrow that failed it was the top one
So thats what makes me anti anything with a thread on it being in sheer. Thats why I will be doing the same as your lower wishbones but top and bottom on all four corners. All those are just under compression or stretch which would make me a happy bunny.
Bob