power steering drop arm switch?

using a discovery power steering box do i need to change the drop arm for one from a 90

if its disco box with drop arm without ball joint in it ,or fit with drag link from disco too

so i dont need to change it for a land rover one?

if going on def and drop arm from disco has no ball joint arm will have to be swapped ,or you can fit drag link from disco as well as it has 2 x ball joint but track rod also as disco has steering damper on track rod not drag link like def, if disco has drop arm with ball joint just fit arm and box the same as def

ahhh i see, much appreciated!