You won't be stopped for the lids stickers, or at least in 30 years I never have been.
If you are stopped for something else, they can go to town. Spanish police especially seem to like finding rules to apply to tourists the locals blatantly ignore. If they have a mate with a helmet shop and you were over the speed limit.....
If your lid looks like a motorcycle helmet and you ride sensibly you'll be fine. If it's something your Grandad brought home from the war and your dad added cow horns to, then yes buy one when you get here.
Andy
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