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Just keep an eye on them. If you have bad pollen problems, or, say a cotton wood tree around, you can plug up the air intakes/exhaust ports. That is the reason they are there. To cool the main gen and engine. Should not be a problem as long as you look at it once in a while while running.

Not strange at all. When the government buys several thousand switches, you have to do something with them. Yes version three switch is the best. But you can still use a version two or even a one. They work. You just have to know that they fail earlier. And, you don't HAVE TO BUY NEWER ONES...