I think the problem with the tips from amazon that you found is that the inlet seems to be centered. From visually looking at the tips coming out of the muffler, the inlet should be slightly on the side as the outlet for the muffler is not perfectly centered to the valance gaps (although this is from memory, I'm not actually looking at it as I write this, something to check on your car first if the muffler's outlet is dead center with your valance gap).
As for the part numbers, yes, it's for the full catback, not only the tips. I don't think Magnaflow sells the muffler/tip/piping portion on its own. Things to look into I guess. If you already have a 2.5" catback system, I agree it would make more sense to only swap the tips, just visually check and measure everything first (including length from the muffler to the valance, you don't want your tips to stick out by a couple inches).
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