I've heard of several ways to swap to 5 lug wheels but it depends on which axle you have and what size front rotors you have stock (11" Lincoln Mark VII rotors onto a 5.0L LX or GT will give you 5 lug).
Also '87-'88 Thunderbird Turbo Coupes have 8.8" differentials with 5 lug axles, '84-'86 Mustang SVO, you can also swap any mustang differential assembly from basically any '79+ mustang if you'd like to upgrade (if you have a 7.5" differential).
If you just want the axle shafts with 5 lugs, and you have a 7.5" diff, i heard two either passanger or driver's side axles from a Ranger swap over and are 5 lug, but i don't know about any rotors that would fit and have 5 lugs.
What kind of mustang are you talking about and what rear does it have?
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2005 Suzuki Hayabusa GSX1300-R
1980 Ford Thunderbird - 255 V8
ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain
hi-po Mack Truck hood emblem
1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc.
Sold 02/06/04 
1989 Mustang GT ET: 13.304@102.29 mph (5-24-03)
Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)
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