Well, all you have to do is replace the pedal pad. it should slip off very easily. Take a look at the back of them. They slip off and you can pull them off by hand, takes about a minute.
Saleen, Steeda...hell, just about everyone makes aftermarket pedals for mustangs so it should be easy to replace and most of them have you drill and put screws through the actual pedal. If you buy a set of new pedals they'll have thorough instructions on how to replace them. Good luck,
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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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