As Naki mentioned, I have just finished same job due to rust perforations in the crossbeam.
I cleaned everything up using steel brushes on angle grinder, gave it some phosphorus acid, washed, degreased, zink sprayed, POR15-painted and finally coated everything with spray wax Dinitrol 77B (if I remember correctly).
I used original bushes for wishbones and v-mounts and polybushes for ARB. New stub axles and one ball joint changed as well.
BR Leo Jensen - Denmark
XJ40 3.2 LHD 1992 (VIN: ...660341). Owned since Nov 9th 2005
XJ-S V12 coupe 1977 (SW53309BW). Owned since April 28th 2016. http://www.xj-s.dk/home/
Citroën 2CV 1975. Owned since Sep 1st 1984
Board member of Jaguar Club of Denmark