Having had several cars i can honestly say i have never replaced as many parts on suspension as on my 156.
I buy Delphi parts which are as good as ***** they last 2 years at best, I have observed that the reason why the top bushes go is due to the fact that when you tighten the retaining bolt in this nips the bushes, and creates wear as it stops the arm swinging or it runs out of true, additionally the whole thing either tightens in use or slackens off. this also happens with the bottom trunion bolt and stresses the inner rubbers.
Tip, buy 2 new bolts that hold the strut to the 'tuning fork' before you start £2.00 from ***** dealer this is the key to an easy life with ***** suspension removal, buy some 17mm amd 19mm half nuts and full lock nuts to lock the big pinion bolts into the correct places the half nut is back tightened on the nylock ( use some thread locker to finish) .This allows movement and stops them tightning and locking up hence no wear top and stress back into the rubbers on the bottom arms, however i have no taken to stripping the suspension down twice a year spring time and just before winter lots of grease on the moving parts. and back together.
Its a chew on the first time bit i can now turn a corner round in 2.5 hrs including dropping off the strut.
By the way you need to jack the ARB out of the way a little bit to get the bottom arm to locate just right otherwise you will chew on for hours.12 inches of 3X2 on the trolly jack end on. othewise its a 1 hr job max.
and buy a good ball joint splitter not a chisle one and put some grease on it so t slides over the rubber.
bottom arm £63.00 + Vat 1 year warranty ive had a 14month swap out before.
top arm £37.00 + Vat same
The ARB's are a pain either live with the noise or fit new