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Hi Rod, Cambrian are a company that make odds and ends for 16mm and other scales. Their 4mm kits are similar to airfix where the parts are moulded on a sprue. Their 16mm rivets are made in a similar manner and come on a sprue. They also do bolt heads that might be handy.
I have used "rivets" designed to stick on to finger nails. This was a suggestion on here a couple of years back. The 1mm ones come as a flat disc but the 2mm and 3mm come as half dome and flat backed so easy to stick to styrene sheet . The 1mm ones require a tad of pressure to ensure they stick, they are obviously punched as in the bag they are usually 4 or 5 deep. I have just noticed one of my wagon rivets is double thickness
I buy from a Swindon based ebayer and they come in bags of a 1,000 for about Β£2 post paid.
All said and done the brass rivets look really good but are more expensive. I may use some to secure the planks on the latest build. Model engineering suppliers carry them or Macc on ebay.