I need to replace the rear window glazing rubbers on my S2a, that's the two small windows each side of the rear door. The originals rubbers seem to be 3/16" for the glass, 1/16" for the body and body to glass 1/4" , I'm guessing 5mm -1.5mm -6mm would do the job but I dont think thats a stock size. Can anyone suggest a source? Or has anyone had success with any of the regular off the roll stock sizes?