We have worked to recreate the often broke, missing or white plastic divider trim.  This H-Channel is made out of a more flexible material that does not require cutting on the back side but remains stiff enough to sit straight between the panels.  You will get 20 inches, enough to do both sides of a 1422 front door with a couple inches to spare.  If you desire a more shiny finish you can wax this with automotive wax.