Does anyone know where I can get new window channel/run for my '68 Cadillac? I need the kind that has the stainless steel bead on the outer edge on each side. This would be for the door windows, front and rear. The lining in mine is shot and I want to put new channels in when I take out the windows and replace the motors. We did this to the '53 Ford last year and it made a HUGE difference. Thanks for you help!