SBP to BBP Adapters & Mopar Police Wheels & Tires?

I think they're going to be tight on the fender side. Keep in mind that the rims already have the right offset for these cars without the adapters. The police rims are 15x7 with a 4 inch backspace

The narrowest SBP to LBP adapters I've seen are over 1/2 an inch thick. Even on the narrow side, that will mean your effective backspace will only be 3 1/2 inches. Not saying it won't work, but it will definitely effect the width of the tires you'll be able to fit without rubbing on the fender.