My stern had exactly that kind of fold up ladder but it had to be custom fabricated to make it all fit properly. Cost was over $2k to replace after Ivan..but it was in 1.25 stainless so I'm sure 1" would be a bit cheaper.
It is quite an exacting thing to have it fold down to an appropriate length and then back up within the pushpit neatly. We ended up moving ours to the side of the boat and had push pin releases made so we could put it down on either side gate which helps getting off the dink with supplies in bad weather! IMHO...the stern on your kind of boat (and mine) is not the best place for a swim ladder. Fine if you have a sugar scoop...but otherwise, the hobby horsing of the boat in any kind of chop makes boarding difficult.
No longer posting. Reach me by PM!