the front bushings are a bear to take out and replace and appear to last almost the life of the car. The rear are another story. I have always just replaced the rear ones on my 240's ( I've owned 5 different ones). I'd suggest just doing the rear ones and then when this new pair goes out, replace both front and rear and get a new arm,as the rear opening seems to splay out with ongoing replacements. This then needs to have some tack welds to hold the new bushing in place. Not a good set up.
Hope this helps,
el raidman
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