They are good lids, but the site is confusing. I think so many different brands and models within each brand are complicated. Here is what their site says about overflows:
Does my lid come with an overflow cutout?
All lids that are currently listed (by name, make and model) on our site which also require an overflow cutout will receive one standard. This is known as Stock Configuration. On Custom Lid orders, you must order an overflow cutout if your overflow is less than ¼” below the rim of your tank.