Either front rear wishbone bush http://www.ebay.co.uk/itm/BMW-E46-3-SERIES-FRONT-WISHBONE-ARM-REAR-BUSHES-PAIR-98-05-D3-015-/110940202907?hash=item19d48d279b Or drop link. http://www.ebay.co.uk/itm/PAIR-BMW-E46-3-SERIES-98-04-E85-E86-Z4-2002-FRONT-DROP-LINK-ROD-D3-090-/261131178218?hash=item3ccca190ea It is common for people to change one side, lazy but common. Why your under there, you may as well change the control arm http://www.ebay.co.uk/itm/BMW-E46-LOWER-CONTROL-WISHBONE-ARMS-BUSHES-KIT-x-2-/400395532292?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item5d396ef804 Also shocks will need doing soon, so get some springs too. Rear shock will need replacing soon too. Dont panic, all this can be done for less than 300 notes if you do the work yourself, simple stuff, just 2 awkward bolts in the control arms.