DC19-V268B40-AD Door System Center Door Roller Assembly for Ford Transit V348 The DC19-V268B40-AD Center Door Roller Assembly with Long Shaft is designed for the Ford Transit V348. It is an important component of the door sliding system, used to support and guide the center sliding door during opening and closing. The long-shaft roller assembly helps the sliding door move smoothly along its guide track and supports stable door operation. This replacement center door roller