They should fit on 5.5" rims. They may or may not fun under stock fenders when on those rims--it depends on the exact car you have, plus the offset of the wheels. (Aftermarket wheels almost never allow 205s.)
There are 6x15 wheels available in 4x130 pattern. Look for "Panasport", "Revolution", and others.
http://www.ttrsracing.com carries some.
--DD