hi there i have a 1990 200 3 door and my front seats were knacked so i replaced them with seats out of a 4 door 300 from a breakers all i did was slid the seat forward and unscrewed them from the runners had to slide it back to do the same on the rear screws and then fitted to my 200 they fitted my metal frames no probs and it all works fine the only thing is they are grey and the rear seat is blue but it dosent look out of place the seat runner were the same on the new seats as my old ones so i now have spares just incase i need them