Anyone know if 2007 Shelby GT500 rims / tires will fit on a 1994 Cobra?

The shelby tires are:

front: 255/45/18

rear: 285/40/18

My car currently has 17 x 9 Cobra R rims on it with 255/40/17 tires.
Car also has Steeda Sport springs.

Any info on the backspacing of the Shelby rims would be helpful as well.

Thanks!