Yes, they will fit, but they are not the exact size. You will need to find out if the wheels work with hub-centric (hub centering) rings. You also need to know the wheel bore size. Using hub-centric rings matches the Riv hubs to the Bullitt wheel center holes. These rings must be ordered custom to fit your specific hub and wheel. The Riv's hub size is 70.3 mm.
You also want to consider the offset/backspacing of the Bullitt wheels, and whether or not they will mount flush to the Riv's body. Being the Mustangs are RWD, they probably use a deeper offset, so the wheels might stick out on a FWD Riv. If possible, have your buddy let you bolt one on the front and see how they look (you can test them without using the hub center rings, just don't drive on them).
_________________
'98 SC Riviera • 268k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30
3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails
KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers
EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch
'05 GTO • 49k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26
Because fun
