Does the Chevy s10 truck mirrors take a special nut to bolt mirror on?

No, Chevrolet S10 truck mirrors generally don't use a special nut. They typically use standard metric nuts and bolts, though the size might vary depending on the year and model of the S10. You'll likely find standard nuts and bolts at any auto parts store. However, always check your owner's manual or a parts diagram specific to your truck's year to be certain.