Yeah I bought it, I received it the day before yesterday. The seller ships real prompt and fast. It was $79 for the kit and window plus $10 for shipping. So all in all I payed $89 dollars. Supposedly he makes the windows to fit the Z1, Z3, E30 and E36.
I'm a little afraid to do it myself, so I'm going to have it estimated at this place that was recommended to me up in Santa Monica. Hopefully, it won't be too expensive since I have the window.