The two clips kind of resemble the tabs on beer cans. They had a hole in them and were held in place by a small spring. I'm not sure if a spring that small is available at parts houses. A spring out of a retractable pen might work. If you loosen the wiper motor a little, you can twist it around a little and see what you are doing. The arms go on about a 3/16 post with a snap ring grove towards the end. This is where the tabs go and the spring keeps them in place by pulling against each other.