Measure the glass with calipers. Measure the channel with calipers. Subtract glass thickness from channel width and divide by 2. Use a tape with that thickness or a little larger. Try a short section of tape. There is no exact way to tell you. I've done several 55.2-59 windows and I think it was .045 tape. Can't remember. You are mistaken about your options. They are 1/32, 1/16, 3/64 (.045) and 5/64. Use decimal equivalents in your math.
Glass used to be 1/4 (.250) Thick, now-a-days it is made off shore and is 6mm (.236)
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