you could use the older arms with this axle if you have the older axle bolts as well. it will bolt right in.
you can also use 99-04 arms but will have to swap out the axle bushings for the correct size and get the correct axle bolt set...the difference between years is the bolt sizes for the axle mount points changed.
I just found out that the post 99+ cars have 14mm and the pre 99 had 12mm. The holes in my frame where the lower control arms would bolt up too are 14mm. What about the where it connects to the axle.