Stalker alert! Metallica's James Hetfield, Bon Jovi's Richie Sambora, and other rockers have given their sweat-soaked guitar straps, belts, and jackets to a line of limited-edition watches from SoCal-based accessories designer Nixon. It's ''an ingenious recycling operation,'' says No Doubt axman Tom Dumont, whose jacket was turned into straps for the ''Rocker'' and ''GTO'' models (proceeds benefit the Musicians' Assistance Program). ''My fans can now wear a killer watch that smells just like me.'' Cool, in an icky sort of way.