Will The Mod Squad become part of the Lynch mob? Now that Twin Peaks has featured Julie and Linc (Clarence Williams III), two of the three principals of ABC's 1968-73 series, can Pete (Michael Cole) be far behind? The idea of a reunion hadn't struck Cole, 50, who's seen ''a couple of episodes to see Peg, but I got a little lost.'' He appears as Dr. M'odsquad on Farrah Fawcett's CBS mid-season comedy, Good Sports. ''I save her goldfish,'' he says. Would Cole like a chance to emote among the Douglas firs? ''Absolutely. I'd do a lot of things that David Lynch would ask me.'' Who knows, maybe the Squad's beloved 1950 station wagon, which took a cliff dive in the show's second season, will reappear wrapped in plastic along the Peaksian shore.