Hull Design Question for Ladder

[jleft]

I am looking into installing a boarding ladder on my 1997 191 Elite.  I called the Champion factory and was told they don't have records of parts for boats that old, however, they do still carry a SS two-step folding ladder for a 2005 193 Elite.  They sent me the picture and it appears to be generic enough to fit my boat, but was wondering if any of you Champion experts out there could tell me for sure if the hull design of my '97 191 are similar or close enough to the hull design of the '05 193?  Any information would be much appreciated.  Thanks!