Friends, My '68 Charger is fitted with Circle Racing Billet Magnum 500's, 17x7 front, 17x8 rear. Tires are Nitto 450 P225/50R17 front, P255/50R17 rear. I'd like to have a "spare" to finish out the trunk area that would look good and be functional. Should I use a OEM type 15" or 16" steel wheel with appropriate tire, or should I stick to 17"? Any ideas appreciated!