the rear glass in my 1998 pontiac bonneville was broken due to an unfortunate mishap. it did not take very much to break either. a small tap, and it completely shattered. i visited 2 glass shops and was told gm does not make the rear glass any longer. is this true?the car is not very old. this is very dissapointing. do i have to resort to a wrecking yard for a new glass?there may not even be alot of these available.