Abstract: An anti-rattle arm rest for a motor vehicle seat assembly, particularly for seat assemblies used in for van conversions, having a seat base, a seat back, and an arm bracket preferably fixedly attached to the seat back. The arm bracket has at least three walls, the first and second walls facing one another, and the third wall connecting the first and second walls. An arm is connected to the seat back at the arm bracket, and is movable from an up position generally parallel with the seat back to a down position generally parallel with the seat base. Extending perpendicularly from the arm is a rod which is insertable into and through first and second openings in corresponding first and second walls. A pin having a diameter extends perpendicularly from the rod. The arm bracket has a pin receiving groove which snugly releasably receives the pin when the arm enters the down position.