Hmm...
I looked at the ZZP 2.5" cat-back, which is direct bolt-on.
3800 Parts 2.5" 97-03 Grand Prix Stainless Catback Exhaust
I noticed the muffler hangers are on the sides of the muffler rather than extending beyond it as the OE-style muffler.
WALKER(R) EXHAUST SYSTEMS :: E-Catalog Lookup
(Walker's picture is upside down.)
The tips on the ZZP are also right up against the dual-out muffler. This means the mufflers should sit farther to the rear than the OE system.
Welding new hangers to the sides of the Walker mufflers (so they can sit farther back) might be another option to allow the TruBendz kit to be used without (much) modification, but it depends on the Walker mufflers being vertically short enough to clear the body, and also allow tips to sit at the correct height. I suspect there's a good chance they would sit too low, but I'll have to get out under the car and measure things. I'm sure the ZZP mufflers are vertically shorter than the Walkers, probably shorter lengthwise too.
Or just buy the ZZP kit, sell/return the other parts, and live with any increased noise/drone. Probably wouldn't be worse than my old droning rust-hollowed mufflers.
