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For one of them, use "fiat 3 pin to obd2" as a search string. They are on Amazon and many other places.Here is the one to the laptop: https://www.lonelec.co.uk/Motorbike-OBD-Diagnostic-Cables/component/TuneECU-Interface-Cable-Lead-Diagnostic Most guys say only use the Lonelec cable for this, but there are some others out there.Lonelec also has the "Fiat" plug cable, https://www.lonelec.co.uk/Motorbike-OBD-Diagnostic-Cables/component/Guzzi-Ducati-Aprilia-3pin-OBD2-Adaptor , so you could order both from the same place. Yes the UK.Not sure if there is a US place like MG Cycles that stocks these or not. I bought my "Fiat" cable via no name company on Amazon and got the OBD one from Lonelec via eBay.
I beg your pardon for being so thick but am I correct in assuming that you need both cables to create a path from the original three pin connector to the USB port?