I would bet that you could find them in a local boneyard for a hell of a lot cheaper than shipping would cost you for a pair. If not, check with a local speed shop that does Mustang work. They've more than likely pulled more than their share for upgrades and have the stock ones laying around collecting rust.
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Jeff Chambers
Trophy Stock #3
11.97 Seconds / 114.5 MPH
Chambers Racing Team