Ferrari Enzo? I don't aim to offend you man, but that's a bit childish to ask. Those parts are rare and expensive as heck, the ones that come from the few totalled Enzos are bought by collectors for serious money. The Viper interior parts are more possible (since it's a mass produced car), but still somewhat hard to get and will be a bit tedious to make a seat out of it by yourself.
I'd reccomend just buying a Playseat/VirtualRacing cockpit/Fanatec Rennsport cockpit/Obuto 0zone cockpit. Cheaper, easy to assemble, and very fun nevertheless.