Removal of the rivets aren't required to remove the front drums, you can take the bearings apart to remove them (the bearings should be repacked as part of the brake job). if you want to replace the drums, then the rivets will have to be removed. Not a big problem to deal with, cut them off or drill them out. The rivets do not need to be replaced, their primary function was to hold the drum/hub assembly together during assembly of the truck. If you plan on running an aftermarket wheel, they will have to removed to allow the wheel to fit flush.
