While the FSM states that the suspension arm must be replaced in the event of an out of tolerance lower ball joint, replacement parts are available. AutoZone carries one for $75. The rivets must be chiseled off or drilled out. I've done both on GM vehicles. The new ball joint should come with new bolts.
AZ shows a press rental available. I don't know if you will need it. I never needed one on the GMs I did. All the ball joints on my 01 have been replaced by the PO and all are bolted in now.