Hyundai notes that the rear trailing arms on 2016 Tucson vehicles have been revised on vehicles produced after July 26, 2016. This also affects service parts. Anytime a rear trailing arm needs to be replaced on Tucson vehicles built on or before July 26, 2016, it is necessary to replace BOTH sides. The previous trailing arm part number for the LH arm is 55270-D3050, while the new P/N for the LH arm is 55270-H3000. The RH previous P/N is 55280-D3100...the new RH arm is 55280-D3200.