A niche classified but someone might be interested:
I have for sale some replacement Persol 649 Lenses for the size 52 model. Brown colour.
They are the genuine factory lenses which came with the glasses - as soon as I received the glasses, I had the brown lenses taken out at an optometrist and replaced with polarized lenses which I prefer.
Not used at all since I took them out as soon as I got them so no marks or scratches.
Looks like they cost about $50 shipped from...