As the attached photos show I replaced the factory swim ladder with a Garelick Telescoping Stainless Steel Gunwale Eez-In Hook Ladder, Model 06131 (whew). I got it at Boater's World:
http://www.boatersworld.com/product/367420205.htm
An unexpected bonus it that it fits into the ice chest which we use for storage. Hope this info is useful.
My thanks to AstroDiver for the lead.
MM
a.k.a. Ensign Runaground