69 1/2" belt.
Most places will hassle you on asking what its for, and say" that's not in the computer" " i can't find a listing for a mustang w/ no power steering"
The belt numbers run like this.......
#60695 would be 6 rib, 69.5 inches
you get the idea, you may have to show the kid at pep boys what you need.
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4.10's,long tubes & 75 shot...Goes 12.50's
Check it out at
http://www.burnouts.webprovider.com