DOGHOUSE RETAINER, DOOR ASSEMBLY INCORPORATING THAT DOGHOUSE RETAINER AND METHOD OF ADJUSTING A GAP BETWEEN A FIRST COMPONENT AND A SECOND COMPONENT

A doghouse retainer includes a body having an end wall incorporating a clip receiver and a sidewall having an ultrasonic heating concentration feature. A door assembly is provided including a door inner and a door trim panel incorporating such a doghouse retainer. A method of adjusting a gap between two components is also provided.