handsome rob

Hi, we have just bought the wife an 06 focus zetec with standard areo wipers on it , can you retro fit piaa wipers instead ? , it looks like the standard ones might pull off the arm and leave a small square hole,(they are not locked in but are very tight) im sure there is an adaptor in the fitting kit that goes onto the arm and locks in the square hole, Thanks for any advice, as i dont want to try forcing the fittings off the arm without knowing first.