The rear blade bush and the bush your specialist is talking about are 2 different things, there are 18 bushes on the rear subframe if you include the ARB and ARB end links. I have replaced every singe bush myself on the rear subrame and the lower control arms will be seized, will need replacing and will need new bolts, i had to literally cut mine off as does every one!! Dont bother buying cheap imitation control arms either i did and had to modify them and add strengthening plates as they were weak. Only problem is ford charge about £120 for EACH arm. Its a complete arse of a job but the results where worth it
control arms that will be seized
Rear blade bush
All together again