MJ;
Do a search on this subject. There is a lot of information and suggestions. The gasketing seals you are speaking of are called a windlace. There are two different types but as you stated, you should have a track in your later model. Be prepared to use a lot of lubricant but the biggest help you can do is to use a wide flat blade screwdriver to "open" up the tracks. Then you need to scour out the tracks with the screwdriver blade or other suitable instrument to remove any old dirt or other crap that will hinder your replacement seal. Then, with the windlace, start at one end (I started at the rear of the door frame) and pulllllll it around using lots of the lubricant. If it slips out of the track, close that section up a bit with a light hammer blow. Just enough to snug it but not impede its progress. Be patient and you'll get it done.
