You have a few hours left to try and be the new co-Flo in those perky Progressive Insurance TV ads. The car coverage people are hosting open auditions for an assistant to their well-liked spokeswoman, played by Groundlings actress Stephanie Courtney, at Metropolitan Pavilion at 125 West 18th Street until 6 p.m. today. So far they’ve had many takers — from perspiring actors to real-people types, some of whom have arrived wearing their own homemade Progressive aprons — but they tell us they’ve got room for you if you want to run over and try out for the white-smocked star’s helper role in a national campaign. No need to prepare anything: just bring your “camera presence,” “originality,” and “overall appeal,” on which you will be judged (but cheerfully!).