Telescoping ladder needed

[bigdog]

Need some help.....

I have a telescoping 2-Step ladder, which mounts under my swim platform.
Unfortunately, 2-Steps is extremely difficult to get in and out of the boat.
Kids seem to manage OK, however if your an adult, you have to be very flexible and strong, to pull yourself up the ladder on to the swim platform.

Can someone recommend a boat part supply vendor who may sell
3 or 4-Step ladders ? Please keep in mind this is an "under-transom" mount.

FYI, I have looked at the big discount boat suppliers, but most don't carry
the "under-transom" mount design in their inventories.

Any information will be appreciated.
Thanks!