18-f150

Just took delivery of a 2018 supercab with sunroof and the sunroof seal is off in one corner and under the glass right from the factory (truck was special order). The body shop at my Ford dealer says the seal and glass come together as one piece and have to both be replaced. As a result the truck will now be tied up at the dealership for over a week as we wait for the new glass. This didn't sit well with me so I looked at parts.ford.com and it clearly shows the seal and glass as separate part numbers. Is my dealer jerking me around or do both need to be replaced?

Thanks.