porsche parts

[superb]

i have seen and read about people using all these porsche parts brakes trailing arms trannies, shifters etc but i never can seem to find any of these parts were is a good place to start. and are these porsche parts that much cheaper then vw aftermarket. i understand the signifigance of the porsche parts and all but if im goping to spend the cash why not get the best , porsche or not hope some one can help