It's easy. Summit, Jegs, or any other speed shop can get them for you. The easy way would be to go the the hardware store with your o2 sensor and find a nut that will thred on the sensor. Drill a hole into the collecters and then weld them on. Should cost you 50 cents and a hour of your time.
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NA 347 W/ stage 2 Canfield heads, out of the box Victor 5.0 intake, solid roller cam, Aeromotive fuel system.
MY CAR
http://www.mustangworks.com/cgi-bin/...splay.cgi?1288