I have a nasty exhaust leak coming from between the manifold and y-pipe, a flange gasket should go here right? No local parts houses list one, O' reillys even said to use sealent.

 

I see thread is somewhat old but neverless there is no gasket on the driverside ypipe and as for the passenger side there is a spacer that goes there. I myself am looking for something to seal that ball flange on the droverside I will let you know what i come up with.