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mmandley's link says 3, 4, or 5 FEET, razz's says inches. Assuming it's actually inches...

Yeah, that is cheap. 3 feet is the smallest height... wow. If you're only covering the part of the transom thats susceptible to board hits you could split that piece at least 4 ways!

3M makes the clear vinyl film you're thinking of. It's a popular addition to the front bumper of cars to prevent rock chips, usually called "clear bra." I've seen it available at some of the nicer...