IIRC the 98 Cobra wheels were a 17X8 with a 5.72 backspacing or a 30mm offset.
I have run these on a couple of different Mustangs with the SN95 spindles up front.
The SN95 lower control arms will also affect wheel offsets. The control arms will help with alignment and tire wear, but you will have to adjust your offsets.
I currently run Cobra R's on my PC at 17X9 24mm offset with the stock Fox control arms.
If I install the SN95 control arms I would have to change to a 36mm offset to keep the wheels inside the fenders.
Good Luck!
Trey
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