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For more on marking an answer as the "Best Answer", please visit our FAQ.They have a 9 step normal ladders here. Maybe you can glue some sandpaper on every second rung yourself. Not sure if this is long enough either - no length given.
http://www.medicanima...uct/~product_id=B1414
http://www.medicanima...uct/~product_id=B1414