Bbk L/t Flange

I just installed a set of bbk long tubes and im cutting the cats off the old hpipe. I want to use the old hpipe so I can connect back to the stock muffler system but I cant find a fitting for the end of the header. I believe its called a ball and socket joint but all the ones ive seen are 3 bolts and these are only 2 bolts. Any suggestions? Thank you in advance.
 
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