Here are good used stock air filters assemblies that were original equipment on later Sprites or Midgets that were fit with HS2 carbs. This assembly will not fit on H1 carbs but work nicely on HS2s and is a less expensive option than the K and N air filter assembly.
These units come with used filter elements or you can select to include new ones from the drop down menu. Generic air filters are available in our drop down, or you can upgrade these to deluxe lifetime K and N filter elements that go inside this assembly.
Here is a simple way to identify which carbs you have on your Sprite-both H1 and HS 2 carbs are shown below: