Are the 17" wheels needed to clear big brakes? If not, use a 'normal' size. FWIW, '98-2002 Crown Vic/Marquis came from the factory with 16" wheels to clear their bigger front brakes. Same bolt pattern and neutral offset that our Cats take. Lots of those year Crown Vics/Marquis in the junkyards... Or you can use Ranger/Explorer.
As for 17" steelies, that's '03-up Crown Vic police car wheels, but they have a huge 45mm offset.