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The reason it needs to be a FF and not a cup is the cup one is not as meaty. The normal 172 (FF) has all the same acessories as the 182 whereas the 172cup doesent.
Trophy is just a suspension upgrade, it's nothing to do with the electrics.
that's an online parts catalogue. it requires IE not firefox and 1 or 2 other bits but it's easy to get working. Have a look through and see if it can help you RE part numbers. If not put up a dialogys part number request on the forum and ask someone for the cup/FF part numbers so you can distinguish