Hi,
tip for when reinstalling is to use a set of Vyse-Grips to clamp the large round locator(other end to the thread) into position in the subframe until you can get the nut on and done up, in fact the Vyse-Grips will normally fall off as you get near the end of the thread. It also makes it easier to get the nut on the other end.
You can see in the inset picture that the bushes are tapered towards the centre. Early model Mokes(and Minis) have arms with no taper and require a different bush.
There are also bushes available that do not have the shoulder on them, just a smaller bevel going back the other way. Don't buy them, they don't last as well as the shouldered variety. I also have a preference to use the rubber bushes over the coloured urethane bushes, but it has been a awhile since I used them so maybe there are better quality urethane bushes on the market now. And while you are there make sure the front mount bushes(out of the picture on the top right) are in good order or replace them too.
And I normally only undo the bigger nut on the ball joint and leave the tie rod(or castor bar) attached if I am not replacing the front bushes but I loosen the nut at the front of the sub frame and the smaller one on the right in the picture. You want there to be free movement all round and you want everything connected before you tighten all the bolts back up otherwise you will do a lot of grunting trying to get it back together.
Terry