Hey everyone, I recently bought a pair of x metal's and the previous owner was using them as rx glasses. So I need to buy new lenses for them. They are the silver to greyish color. I am not a real avid Oakley guy however I know the popularity and value of these is pretty high so I went ahead and picked them up. My two questions are; how I figure out which are the original lenses. Also, would their value go up with the original lenses or would they be more valuable with a more popular lens color? I appreciate any assistance..