David,
Usally the window chrome moldings are well suited for rechroming. They are made of brass and unless
they are damaged I think your best option will be rechroming.
Finding new ones will probably be close to impossible, or very expensive..
To reinstall the window frames you need to replace the rubber gaskets, sold by the metre and lots of patience and persistance.
Heat and soapy water might help as well. Its a fiddly job, especially the rear ones.
If your door map pockets are the European version I might have chrome trim stashed away somewhere
Hans