I've had a lot of help with the interior of my '49 Chevrolet National funeral coach from Tim Prieur, who has provided great photos - thanks Tim. However, I have not been able to figure out if there's a difference between chevy and pontiac upholstery or between the years of National's coachworks. Joe's 51 seems to have different stitching. Does anyone know if the upholstery stitching varies between chevy and pontiac or the years? Or if there's a difference between a ambulance and hearse combination.