Cat flanges?

[Michael Gough]

Hey guys,
After some investigating, it seems that the cat from the turbo syncro has a
melted core. I guess that 10:1 air/fuel ratio during the EFI tuning finally
caught up with me! Anyway, I need a new cat, no problem, I can get a nice
universal that's the right length for about 60 bucks.
The problem I'm having, is finding some of the 3 bolt flanges that have the
chamfer for the metal doughnut. Does anybody know where I can find these
flanges or am I going to have to cut them off my old cat?
Thanks
Mike