They need to put pictures of the products on a car IMHO. I'm not really sure what part this replaces.
Koshi's stuff seems great and I have seen many favorable reviews from those that have bought their products. That said, I think they would sell more if they did a better job marketing each piece (e.g. detailed description, close up pictures of product installed, high resolution beauty shots of the product installed, etc.).
Just my 2 cents obviously. I just struggle to visualize some of these things.
LE #425/500 - Madreperla White