It will be standard metric sockets/spanners but there may also be some torx fixings and possibly some unique to Fiat. If your hubby has a good selection of tools he probably has all he needs.
Suggest you get him a suitable Haynes manual which will normally detail any special tools required.
But to be honest if he does not already have the tools I would suggest using a garage to do the work. Having the right tools does not make you a mechanic and jobs like this on modern vehicles need a bit of experience.
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