Dart door window channel seal frustration
The reproduction vent channel seals from Classic Indistries are not even close to OEM. The plastic slider blocks are NOT the same and cannot be used. You still need to trim to length the seal and make the slider block holes. It is the same vent channel seals Classic sells for B-bodies. You shorten them to use on A-bodies. I ruined two sets of these at $100 a pop before I figured a way to install them without destroying them in the process. 
The reproduction vent channel seals from Classic Indistries are not even close to OEM. The plastic slider blocks are NOT the same and cannot be used. You still need to trim to length the seal and make the slider block holes. It is the same vent channel seals Classic sells for B-bodies. You shorten them to use on A-bodies. I ruined two sets of these at $100 a pop before I figured a way to install them without destroying them in the process.