WTB: Aqua Step (retracting ladder)

[Legal Chemistry]

I'm looking for an Aqua Performance or ???, basically a self retracting ladder I can place below my swim step. It's a narrow spot ~12". Let me know if you have something laying around. Thanks
http://www.***boat.com/image_center/showphoto.php?photo=127512&size=big&cat=539
http://www.***boat.com/image_center/data/539/medium/rear_step.JPG