My gaz shocks have 1/2 spherical bearings fitted, does any one know if it's possible to remove these spherical bearings and replace with m14 spherical bearings without any machining?

M14 sphericals from McGill have an O/D of 29mm

You haven't specified you application but for a kit car
I would consider sleeving down the coilover clevises and possibly the spherical with stepped alloy inserts.

[Edited on 25/4/17 by Camber Dave]