First picture, Post # 2 - Is what you are looking for.
Modified Cover for Hayward Super Pump for Closing Swimming Pool
Post # 1 (SP-1023) is the part #. This is for the 1.5". If your shop vacuum is bigger, then you will need an adapter. This place has everything you need. If you e-mail them, they will get back to you very quickly, even on Weekends. Explain to them that you wish to have an extension form your skimmer to a 2" hose, if that is the size. Otherwise, the hose that was purchased is in the first post fits the 1.5".
BTW, just came back from Woodbridge-Vaughn, ON this past week. Nice place. The specialty food stores in Woodbridge are really nice.