'Adapters'
Street use is ok but severe duty(ANY light strip or road race is 'severe') is unacceptably unsafe. No tech guy worth his salt will let ANY car with 'adapters' pass tech.
Much safer to redrill the axle flanges or obtain axles with dedicated wheel bolt pattern and use correctly offset wheels.
Wheel SPACERS are a different story TO A POINT. Too much spacer puts tremendous torsional stress on the studs in a strip situation.