Hi Ashnic, Welcome Aboard!!!!
I believe this is a 199 1900SR pic with the same same ladder/ladder cover configuration you have. Hopefully someone with the same model can confirm. It looks like is a hollow space in hte swim platform. My 2800 looks similar and the cleats and swim ladder nuts and washers can be accessed from within. I'm not sure how you'd get back there in that model. Just a hunch, though.