I just purchased a set of 20inch Style #168 wheels (Replica) from a wheel place in Los Angeles, the rim will fit as long as you have a wheel hub adaptor that goes on the hub of the wheel (Get the aluminum ones not plastic), this will ensure proper fitment for the 20inch wheels and stick with the recomended tire size from the dealer for 20inch tires which is -
275/40/20- Front- 315/35/20-rear. Good Luck!