Leaked M0d Auto Spreader Flange

Hey all, So, I found a cheap set of used headers for my thirdgen f-body and put them on and a new catback system. The problem is that I can't get the header-to-y-pipe junction to stay sealed on these. It seems these are setup to take a 'doughnut' gasket like a standard cast manifold would use. But it has standard 3-bolt, 3-inch collector flanges.

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What has happened is that the flanges have warped. You can see it here: In the next photo the lower of the two flanges is straighter (because I replaced it.it's the only one that will come off without cutting a pipe). You can see one straight one and one warped one here. This side seems to be sealed up acceptably: As far as I can tell, my only real option at this point is to actually CUT the collector, put a new flange on, and weld the collector back together. This is not an easy/fun option.but it's a heckuva lot cheaper than new headers for a car I'm pretty sure I won't keep too long (and isn't worthy of new, coated headers).

I figure trying to hammer them flat won't work because they're already annealed from who-knows-how-many heat cycles in the past. I'm posting here in case anyone has some thoughts on how to rectify this problem with what I've got.

Just a 'two heads are better than one' scenario. I'm stuck 'in the box' on this one. Help me think outside it. The flanges float freely on the collector and y-pipe when not bolted on. The driver side portion of the y-pipe is a slip on, so it can be replaced (and has been) without cutting/welding. The other three, I'm not so lucky.