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You can stick any JC5 into the 172 providing you check the speedo drive. If yours has a speedo drive you will have to fit a box with a speedo drive. If your speedo is taken off the ABS system you can fit anything. Keep your eyes open for a JC5 129 or a 130. Be careful of JC5 132's & JC5 125's as there for diesels and will mess your gearing up. Whatever you find pm me and i will give you the ratio's and tell you what the box is out of.