I wonder how the do it?

China Replica Alloy Wheel For Bmw, China Replica Alloy Wheel For Bmw Manufacturers, China Replica Alloy Wheel For Bmw Suppliers and Companies on Alibaba.com

16-20 Inch 112mm Wheels-16-20 Inch 112mm Wheels Manufacturers, Suppliers and Exporters on Alibaba.com

17,18,19inch alloy wheels for Audi .VW products, buy 17,18,19inch alloy wheels for Audi .VW products from alibaba.com

Replica alloy wheel for 2011 M3 products, buy Replica alloy wheel for 2011 M3 products from alibaba.com

Anyone wants to get into the replica wheel business, just open an ebay storefront, become a sponsor here...send emails out to these Chinese manufacturers and let the $$ roll in.

I suspect that all the replicas being sold by small time US vendors are sourced from places like this.