Whatcha building?
92S have single sided safeties. Careful, as all other 92 series safeties are not compatible with the 92S. Beretta safeties are not always a drop in part either. They sometimes need fitting. I’d highly suggest a gunsmith for what you’re doing.
Wilson Combat makes a low profile single sided safety, but it’s for the 92FS series Berettas in case you run into one of those, or someone tells you otherwise.
The 92S are old Italian carabinieri surplus pistols readily available on the cheap. Your best bet would be to find another one for parts. $350.-400.
I doubt you’ll find a replacement slide on its own. Not likely anyone would have just the safety lever and plunger to sell and it may not fit your gun properly.