Wheel / Tire Question?

Considering some used wheels/tires for MY 2002 Z06. Do these sizes seem OK? Front/Rear both 1/2" more narrow than OEM. Rear offset slightly different from OEM '02 Z06. Do I need backspacing numbers?
Thanks.

Front:
Rim: 19x9
Tire: 245/45/19
Offset: 54mm

Rear:
Rim: 20x10
Tire: 275/40/20
Offset: 50mm
Bolt pattern: 5x4.75"

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Wheel / Tire Question?