Well it depends on what your wanting. If you want to go disk then you'll have to change out the fronts and rears to 5 lug. There are no 4lug rear disk for the 99+cars. And to do a swap from drums to disk is going to take a lot of cash.
parts that I can think of
Spindles front and rear
calpiers and brackest
break lines
E break lines
new wheels and tires
I know I'm forgetting something.
Oh yea, disk and pads and bearings
