Did my '21 Touring have a rubber seal between the upper and lower glass in the windshield? Lang's lists the "H" style for '23-'27 models.
You need the offset H rubber.78401 in Langs catalogue.
If and when you get one, glue it on with contact cement. Mine liked to ride up off the glass before I glued it in place. I put mine on the bottom glass with the long side if the "h" to the drivers side.
No rubber seal from the factory between the two windshield halves for 1915 through 1922 model year roadsters and tourings.
In the full upright position, the top pane sits slightly forward of and overlaps the lower pane so a rubber seal is not needed.