I t’s a sunny Sunday afternoon in Lower Manhattan, and the 1970s British punk band Cock Sparrer are trying to find where CBGB used to be. Singer Colin McFaull, guitarist Daryl Smith, drummer Steve Bruce, bassist/songwriter Steve Burgess, and guitarist Mick Beaufoy are in the back of a black Sprinter van, which is taking them from soundcheck at Brooklyn Paramount — where they’re set to play their second sold-out headlining show in as many nights — to Generation Records, where they’re scheduled