Just got the ones i linked to above installed. They worked great and fixed the leaks right up.
They fit pre-cat just fine, but after the cat, there wasn't enough room on the cat pipe to installed it exactly right so that each exact size tube is clamped.
I just put it as best i could and tightened it down with an airtool.. it ended up molding right to the piping and i couldn't feel anymore air!
I got those clamps and they seemed to work, but just started leaking nasty on one side before the cat again. Just got back from the exhaust shop after having them weld it. Couldn't be happier. They worked wonders on my catback, but I guess the pressure before the cats are much higher.
I have 4 of those clamps listed above just laying around if anyone wants to try to see if they help.