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Re: laguna 2 engine undertray
If the existing captive nuts are furbarred you can use roofing self-tapping screws which come with their own large washers. They rae usually known as cladding bolts. Most decent building suppliers stock them and are usually plated to resist corrosion.
See attached picture for an example.
Currently in madnoel10's garage:
Honda Civic 1.4l