I'd just pull the bolts out and install the new studs. I can't imagine it making ANY difference. The same can't be said for rod bolts, but they are a loose press fit. The mains are just threaded, the fastener company is just just covering themselves....in case. They don't know who is calling and their capabilities. You should only need to swap out the center 3. I would, however loosen all and re-torque in sequence with the new hardware.