why would U need M3 arms ?
becouse front control arm has full bush ? not softer as non M3 arm? so can use powerflex bushes if want more stiff suspension ,but do it need for daily driving on irish roads?
have changed lot of these bushes , as arm ball joints last much longer and didnt need full arm replacement ,depends on mileage of course ,and how, and where car was used
straight arm ?
need more negative camber ? for road car? or again becouse of more stiff bush?
original straight arms mostly wears ball joint but not bush , so another good make will last long enough.
my choice - first Lemforder or Meyle ,depends on price and if cant get in these makes ,would go for TRW
BTW if somebody wants to replace only complete arms or all arms , i dont blame them , if u can afford ,go ahead! makes huge change in cars handling and driving .
Rear axle ones,mostly wears top - front and top - middle arms and rear lower axle hub bushes - ball joints
Track rods very common to wear or might be very rusty and cant be adjusted on tracking ,so worth to change them both and in complete units