Arnott's exclusive shock (SK-3611) manufactured for the 2013-2016 Lincoln MKZ (CD533) and Ford Fusion (CD391) rear left side. This shock design delivers the stability, handling, control and comfort of the original OE shock without any external commands from the vehicle. Arnott engineers have determined and tested the optimal internal shock settings to mimic the OE performance. Arnott recommends replacing these shocks in pairs.