Nic
I can assure you it is a LOT easier to fit aftermarket poly bushes, than it is to fit bushes with casings.
Reason being you need a nice big press to fit the bushes with casings and the right adapters like Chris has said....you Don't need a press to fit the poly ones as you are not removing the casing from the LCA or whatever bush you are replacing.
And they can be burned out with a blowlamp, ok takes a lot longer but it can be done, just easier if you have proper burning stuff.
And the oem ones can now be got, there was a thread on here not long ago someone asked the same Q.
Andy
PS
Dave
the lower control arm bushes are just another name for the lower wishbone, and you do have a UCA..upper wishbone.and yes it is good to have them replaced on an old car,not cheap but a very good investment like Nic has said.