[truckster]

If you find you do need to save them, soak them with warm, soapy water. Do it several times over the course of a couple of days. That will soften the old rubber.

To remove the glass, you'll need a buddy on the outside. Starting at the top corner with the top rear, push out as you work the rubber over the flange. There's no locking strip or anything like that, so it's really not very complicated.