wheels on the new 300 are a 5x115 bolt pattern w/ an offset >30mm (cant remember the exact number, may even be a - offset) 5x114.3 will work, but MAY shear wheel studs w/o a hubcentric ring
as for the old school Imp,
IIRC they are 5x4.75 (120.7)
the camaro has a 5x4.75 bp, not sure on offset on either car off the top of my head though.
hope that helps