Upgrade an Onan 7.5 DKD generator to a Quiet Diesel?

Hi all. I could really use some advice. I have a 1993 Gulf Stream TourMaster. We have one of the older Onan 7.5 (DKDFJ) Diesel gensets on a front slide. It has worked very well for us up until recently when it threw a piston right through the block... Needless to say, we need a new generator. I am pretty handy and can tackle most projects and replacing this generator is not going to be out of my realm of ability. My issue is that the older style 7.5 generators are super hard to find... I have been looking with not very much luck... The plan was to buy a working used unit, pull the old one out, pop the new one in and then I would have plenty of extra parts when and if needed. The issue is I can't find one for sale... So the other option is to buy one of the newer Onan 7.5 Quiet Diesels or possibly even one that produces a bit more power in case we ever want to add a third AC unit. I am wondering if anyone has ever done this or had it done. My questions are how it will fit on a slide and if the wiring will be easily adapted? What were the challenges you encountered while doing this? Any and all replies will be greatly appreciated.

Thank you,