Ladder

You might try Trekwood, they have a lot of stuff for Keystone products.

Trekwood

Good luck.

After breaking my 2nd ladder a bought a Telesteps ladder from HD.Collapses down and I can put it up any where around the 5th.Can climb up from back and side also, however, it gets used more to put up zip lines for the grand kids now cause you can move it anywhere.

Thank you I saw a posting where someone had an original but I'm new to this and I don't know how to go find that post

Etrailer

Not specific to your model, but it would probably work.