The grommets are optional and most customers finally do not need them. The purpose is to overlap the vestibule to protect from rain getting in at the connecting point of the vestibule and awning. However, since this vestibule is not a complete enclosure for the awning (sides are still open to the environment) it isn't completely necessary. If you choose to get the grommet kit we recommend:If you do not have the required grommets kits a do-it-yourself kit can be found at a local hardware store such as Home Depot or Lowes. The model number is 1000030533.