If anyone has a left side NA headlight lid for sale I would be interested to get it for my sons car that he is working on.
Send me a PM if you are willing to ship to Sweden.

My suggestion would be to search on Ebay in the UK. People are breaking Mazda MX5 cars all the time, although the Mk 1 with pop up headlights not so often as the Mk 2.

Find a "classied ad" instead of an auction and ask how much they would charge to post to Sweden - it won't be more than about €10 to post and a "gift" under the value of €45 doesn't attract customs duty.

Or get lucky with someone on this site who has one to spare! Is "left side" on the left when looking at the car from the front, or from the driving seat?

https://www.ebay.co.uk/itm/395024446145 and they can arrange international shipping