Hi, thanks for the replies. To answer both Hotrod Lincoln and truckernix answers. The reason for wanting to replace them was because it did seem like one or two of the bolts " stretched " when approaching 110ft/lbs of torque. None of the bolts are rusted. The ones I removed all had three lines on the head of the bolt with either an " M ", nothing or " AP ". It's seems like a hodge podge of whatever the " rebuilder had lying around......
