2000 Z3 Rear replacement Window

I need to replace my rear window on my 2000 Z3, does anyone have any suggestion where I could get a replacement window?

Dealer part, in my experience. I have tried lesser parts and had trouble with installation

Good advice

I just found a polish that actually works on my 99 Z3 2.3 roadster back window
it's called acrylic werks polish can only be found on their website acrylicwerks.com
cost $29.95 for a big bottle. don't replace back window till you try this product
they also have a demonstration on youtube on a Z3 back window. I was completely amazed
I had given up on trying to get window clear, and you don't even have to rub that hard!!
AWESOME