I know that you can basically use any 94-04 A arms with a 99-04 K member (the bushings are slightly different sizes according to MM), however I'm pretty sure that the motor mounts are in fact different. Now if the mounts themselves are the only difference you could swap out yours and put them on the K member, but if it is the motor mount towers that are different I'd think you'd be better off just getting a 99-04 K member that way you know it fits.
2002 True Blue V6 to GT Vert
16.1@86 as an auto 3.8
2.15 60', 9.3@77, 14.4@96 as a 5spd SOHC 4.6