I believe the ladders that are currently on the M 15 and M 17 that Bob produces are from Windline. The telephone number is 310 516-9812. They are located in Gardena,CA. You can order directly from them; it will save you money. I currently have two of them. The three step ladder is model TT-3X. The four step is model R-1185. The former is the one that come with the M 15 and the latter is one that goes on the stern of a Potter 19. I will probably install the longer one of my M 15. So let me know if you are interested in the shorter one. Bert Felton M 15, #365 Zephyr ************** Ideas to please picky eaters. Watch video on AOL Living. (http://living.aol.com/video/how-to-please-your-picky-eater/rachel-campos-duf...)