I need some Ball Joints HELP

I need a set of MOOG (or any good name brand ball joints) for my 99 GMC Sierra 2wd. I have went to 2 different places and they gave me the wrong ones and then double checked their books and said that the book says it's the right ones. If anyone can help me let me know. I need a set ASAP. I need all 4 (upper & Lower)Thanks,Justin