My Stingray 180LX has a 2 rung Windline ladder on the rear platform that I'd like to replace with a 3 or 4 rung. The original ladder had holes that are 12" center to center, and I can't seem to find any ladders that aren't either 10" or 14" center to center. Do you all know of any ladders that would fit my spec, or should I just fill the existing holes and make a bracket to cover them up with a narrower ladder?