but even if you got it(perspeks),
how are you gonna bend it to shape?
cut & paste??
water will/wont masuk??
plus, if all stock, the lens focus the light so you can see the reflection on the road more dense.
if use stock reflector w/o the lens (or use clear lens)... the light will disperse widely... so basicly you'll get wider coverage of light but the reflection density will be lesser (tak cukup terang)
But those crystal head lamps are different, their reflector had been adjusted so that you can get it to focused even with/without the lens cover.
These is basicly physics!