i got told by a nissan dealer not to bother replacing them just put loads of grease on them.i check mine after i jet wash it just to make sure i haven't blasted the grease off.
I replaced mine a year ago & they are almost shot :evil: so will be putting plenty of grease on them from now on to stop the horrid squeak/grind you can get :roll: IIRC I paid about £3 each if that helps but there is 3 different types :roll: