the knock offs have been around for quite some time. you can try Era Maju in JB. They had them then, not so sure about now. The 18X8.5s were going for less than RM3000 new. should be much cheaper now
i have also seen LM-Rs in smaller 15" sizes in 4 holes.
the wheels on the E30 was 18X8.5 LM replicas. Apart from the missing studs from the inside, the look from the outside could pass for an authentic. Though experts would be able to tell from the finish on the spokes