Trooper thanks a lot. Not the answer I wanted but a definitive answer. Now we all know. Don't know where your getting the $80-90 prices on spacers, but if your only using for emergency spare, they can be had on E-bay for @$30 (3MM-5MM). Not cheap cast sh^&. Machined one piece spacers. Thanks again for posting the follow up. I guess that's the path I'm gonna take.
these are the ones I've looked at...
https://adaptitusa.com/dodgechallengermagnumchargersrtsparewheelspacer.aspx
I have 6mm worth of spacer on my fronts now for the R/T rims and tires that I put on for winter use. Those rims wouldn't fit over the front brakes either, but 6 mm just barely makes them clear. Either of the Dodge spares that I bought will require MORE than that 6mm. The original spare that I got from the 2007 300 needs more spacer than the 2015 Charger spare I just got this week.
The 2015 spare fits better than the 2007 spare, but will still need a spacer....and it will need to be more than 6 mm. With the 6mm spacers, the wheel hub will not sit down flat on the hub and I conveniently shaved off some red paint of my caliper when I was trying to see how much spacer I would need.
At least revlon red nail polish looks close enough to the color for the touchup
I found the spacers above on that website after my original search started after one of the members told me what came in his SRT (2009) I think. This is supposedly the same spacer that comes in the Performance Spare kit (which supposedly Performance Spare also sells separately).