Assisted with the fitting of Meyle rear bushings and wishbones on a Z3 last week, the Meyle rear bushes were a real tight fit to get on the wishbone pins, really could have done with a fitting tool but brute force managed it in the end. Special tool to remove and fit these is available but quite costly and from the USA, not found a UK supplier, maybe worth making one.
https://www.ozwidetools.com.au/bmw-lower-control-arm-caster-bush-removal-and-inst