Got a hold of these Herman Miller chairs – help identify?

I've got a hold of these chairs. They were being thrown out, and i saved a couple of them. I also got the metall frame for the chairs, but they're not assembled.

Now there's not much info on them besides a label on the bottom that says Herman Miller.

I've tried searching around on the internet for a bit and found some similar ones:

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https://www.ebay.com/itm/Vintage-70s-MCM-HERMAN-MILLER-EAMES-Fiberglass-Shell-Chair-Green-Free-Shipping/323663579562?hash=item4b5bda49aa:g:5OMAAOSwH2RcSQJI&autorefresh=true

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This one got a different colour. According to the seller it's "Made in USA August 1972 – Covered in original green fabric, with dark green fiberglass back."

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The ones i snagged are more orange, and also two in red.

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Another one i found was this:

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https://www.ebay.de/itm/Herman-Miller-Sidechair-2-Stuck-Vitra-60er-70er-Chair-Stuhl-Design-Panton-Ara/283442749493?hash=item41fe812035:g:208AAOSwo6hcqGKq

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calling them "Sidechair" and saying they're from Vitra made by Charles Eames

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Is this accurate? Any Vitra/Eames/Herman Miller or chair afficionados in here?

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Another question would be the the issue with the look of them. They're dirty as hell.

Anyone know how to restore/clean a chair like this? I don't want to ruin them. Is there a sub for this?

A product designer told me his girlfriend used nail polish to restore a chair once. Would this be a good idea?

Cheers, hope you can help me out.

Edit: added the photo… :)

Great design resource

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