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The bolts are part of the seat runners. Did any snap?
I'd be cleaning them with a wire brush, running a die down them and then coating in copper grease.
The 4 without the caps over them are always rusty.
Are yours separate to the runner assembly? On my MK2 as Louis said they're integrated into the runners at the base (welded[?]). So really cleaning and anti-sieze are the only options unless you fancy replacing the seat. The ones without the seals will always have a rough life because of the water ingress and heat but there's really not a lot you can do aside from keeping them clean and protected.