There were a small number of base model '96-'02 4Runners that came from the factory with 15" wheels, but most had 16" wheels.

I've even experienced trying certain new aftermarket 16" wheels that didn't fit over the typical brake calipers intended for OEM 16" wheels.

Years after that only got larger - maybe 17" wheels (?), so I'd say it's very unlikely that any 15" would fit a 2007.

Jeff
2000 4Runner SR5, supercharger, rear e-locker, ARB front locker, 285/75R16 MT/R's, custom bumpers & skids
2007 Tacoma double cab 4x4 - stock