any that have been mentioned above. It's the same 360 motor, just a smaller displacement. All s/c's made for a 5.9 will fit a 5.2, and vice versa. A sts is rear mount, so a year model and motor size doesn't matter.
but one thing i'll add to this is that the 5.9 and 5.2 kits with little modification will bolt up to the 3.9L.
the 3.9 and 5.2 are the same except for ones a v6 and the other is the v8.. the only major thing i see with that is the headgaskets... the aftermarket for the 3.9L isn't the best and finding really good headgaskets are even worse.
but the good thing is, all the stuff that helps a 5.2 will surely help a 3.9.
does cometic not make a head gasket for the v6's? I know they can custom makes gaskets but that will probably send the price into the hundreds. A set of cometics and head studs, and you'll never pop a gasket.