Hi. I have a Hunter 270 and would like to change my winches to self tailing. However when I looked at how the existing winches are attached I found that it has no backplate. If I increase the size of the winches from lewmar 6 to a self tailing winch do I need to instal backing plates. Can anyone please advise. Also I am in Australia and it is difficult to find hunter parts so will probably just buy whatever I can find here in Adelaide. Thanks. John