69 Fastback rear glass seal issues

Resto shop is nearing completion of body and paint work on my '69. They have tried rubber gaskets from Precision and Steele Rubber. Both fit like garbage. I have had no luck finding NOS #2841 832. I'm getting real discouraged. Hours and hours of getting the body and paint slick. NOS grills, tail panel, new glass all around, plus lots of reproduction stuff. Only to have it look like this. Any one got a new direction for us to go with? Thanks, VictorIMG_1543.jpg IMG_1544.jpg