The HDT 's and JTD's have a classic Fiat thermostat on the left hand end of the block. These stats are different configs across the Fiat range but generally I reckon pipe work could be made to fit. The std common 1.2 Punto has a different thermostat housing with the orientation of the rad feeder seemingly coming straight out the block inline with the engine and I don't think could be made to fit without many couplers and j clips. See the attached pictures. The 1st is HGT, 2nd is JTD and 3rd is 1.2.