You can find the window on eBay. They run about $225, but sometimes you can
find them cheaper.
There is a zipper holding it in. I'd get the new one in hand to see what's
up before taking the old one out. No, the window has to fold, so the E46
window won't work.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.