Brother i'm having no idea about the genuine side mirrors as i got a pair for around rs 1000 and they're very very good. You can recognise the original ones by their body and build quality
Genuine headlights are indicators will be having stamp of stanley on the plus you can easily judge about them being fake or not
Other items you mentioned are easily available and they doesnt have to be bought from 3s , you can buy any good quality one
I'll suggest you NOT to run for genuine side mirrors as they keep on breaking thanks to the bike wala's
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