Thomas there are a few different manufacturers that make that style cup and lid. This manufacturer hasn't changed the size or foot print of their cup. If it's too large, then most likely your boat builder sourced their cup from a different OEM and it won't be a one for one match. Your options would be to find the OEM that produced your cup and lid or widen your existing hole to fit this cup and lid. Our apologies for any confusion. We try to list the specs on our pages so you can have the part size when planning your project.