The original steps on my fiver had one broken rivet that I had replaced with a bolt when travelling. It didn't hold tightly as the rivet has a shoulder. When we got home in the spring I looked into repairing them but I found more rivets on the way to breaking. When I posted abut the issues I was contacted by Torklift about using their steps.
They sent me a set of the 27.5" wide steps in a 4-step configuration as well as the vertical stud adapter brackets.
The OE steps are by Hickory
https://www.hickoryrvsteps.com/7-rise-quad-step
They mount to the underside of the floor with a stud on each side and then a self-tapping bolt into the web of the frame I-beam.