What fasteners for old corrugated cement board garage roof?

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Hi,
I have a flat garage roof with corrugated cement board (including asbestos) sheets. The original nails have curved washers on them about 30mm diameter that are disintegrating due to age and the nails are working themselves out, they are nailed into wooden purlins.
What would be suitable screw fixings to replace these with?
I've looked at Screwfix part 5672P but the washer is only 16mm, would this be suitable?
I've not been able to find any similar curved washers like the originals, probably because I don't know the real name for them.
Any advice appreciated.

Alan.
 

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me neither but can I suggest screwing the sheets down? (assuming the nails can come out?)
less dust than banging nails.

Are the washers curved when new?
 
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