That door glass is held in by imagination mostly.
You can follow factory instruction with glass setting tape and hope to lucky enough to find the correct thickness of setting tape.
I forgo the setting tape method and opt for black Permatex sealant commonly used for water pumps and rear axle covers.
Use painters tape on the channel to keep the goop off of it.
I run a generous bead in the glass channel, force the glass down in it, and let it set, and don't worry about excess sealant getting on the glass.
Tomorrow you'll be able to remove the excess from the glass with a razor blade very easily. Trying to clean it off before it sets up just makes a bigger mess.
If you should break the glass in the future, that sealant is not too difficult to get out of the channel.
