mine were done by my mechanic when my diff bushes started clunking, it is subframe out and its a big job but your doing it the right way, do it all at once.
whiteline are good, i havnt heard much about them being bad sizes.
when you have it out look at what else you can do easily when the ass end is apart, hicas delete, swaybars, all fluids, hows the condition of your diff, boots, shafts, brakes, suspension components. its better to spend a bit more and do anything else in that area as its basically just money for parts, the labors about the same. look at prices through KUDOS if you havnt already bout the parts. also are you pressing them out or burning them ect.