The 79 little red express truck used that size from the factory, that's what i'm gonna put on my 84 D150 project, with 15x8 chrome super spokes Cragars with 3 3/4" back spacing which I know they fit because I fitted them already.

You will want a 15x8" rim with 4" or 3 3/4" back spacing, I'm not sure if a rim with 4 1/2" backspacing will clear up front with the P275/60R15, everyone likes there tires inside the fender well, I like mine right about a inch sticking out, but hey that's just me