There are two types of oil cooler for the CG motor that I've seen; one has a bypass valve, and the other does not. Either cooler provides a new valve cover, and it taps into the pressurized oil that feeds the valve springs. An IN and OUT fitting on the valve cover are then connected to supplied braided hoses (via banjo fittings), and then connected to the heat exchanger. There is at least a couple of heat exchanger sizes to choose from.
You'd have to cobble some mounting brackets together, but that would be the hardest part.
Here's one:
http://world.taobao.com/item/1868825...1.14.77.YOji84