The flanges should have three bolts, and like Paul said should have a gasket in between them (the manifold, flange, and pipes that run underneath the car) Go to the parts store and just ask for doughnuts, they should know what your talking about. Thats a good guess and starting point as far as tracking down the annoying ticking sounds. And if you haven't replaced them already its only gonna cost you a few bucks. Good luck finding the leak.