I have just bought a new drop link - not Fiat! It has 17mm nuts on both ends. My Marea R reg 2.0 has 17mm at the top and 15mm at the bottom. I cannot undo the bottom nut - it's rusted up. Before I cut it off, I want to be sure the new one is correct and will fit. Can anyone advise, please. Will the bigger bolt go into the anti-roll bar?