1989 Oldsmobile Cutlass NEED HELP: Window trim

1989 Oldsmobile Cutlass

I need to replace the window run channel and the window belt(sweep) on both front doors of my 4door Olds cutlas ciera. I have been to many sights on the internet and e-bay but still haven't found it. Any suggestions as to where I might locate these items would be much appreciated. ALSO: Parts from 1982-89 Olds cutlas, Buick century and Chevy celebrity will interchange, so I was told. New or good used would be acceptable. Paulpep68@yahoo. Com or 931-644-8067 Thank you. Paul