The LCAs, UCAs and associated bushings are the same for both 2WD and 4WD. The Moog K3128 is a kit of two bushings for the UCA, is correct, and is what I used on my 2WD. :thumbsup:
Also, I highly recommend installing WJ LCAs instead of just changing bushings in the old ones, especially on a mainly street truck. They are full tubular, much more solid, and make a world of difference in handling as the bushings are larger.