The seller is asking $220 for the ladder and replied to me that it came off of a 79 cvx 16. It looks similar to the IO model, not the outboard. The transom width for the outboard model on either side of the motor is 20.5" and the width of this ladder is 17". That seems a bit wide to fit properly. I bought a telescope type 2 step ladder just like the one Andy put on his restored cvx 16. It's small, but will work and for a new ladder still in the box and under $25, it's worth it.
I will still look, but if I don't find one by June, I will install the one on route to me now.