thats a tough one.. a beretta vertec holster might fit.. i say might because the slide and barrel is shorter.. so it might not fit all the way in if it's form fitted you'll have a little extra empty space at the bottom of the holster.
now if you're talking OWB you could use pretty much anything a 92/99/100/101 (w-rail), or beretta vertec will fit, in some cases you can even use a regular beretta/taurus 92 holster.
i've got a fobus BRV for my 92 but it does'nt have any security on it, would be ok for conceal though.. but open you could still use it just be a little more aware of it.
you can always get someone to make you a form fitted leather IWB holster have to check around for that.
im not aware of any IWB holsters specifically marketed for the 917, but that dont mean they dont exist.