Availability: 6 in stock
The push nut here is the MOPAR part, numbered 68338917aa.
It is catalogued under Nuts & Washers > Nuts. M4.2×1.41.
Match thread size and pitch to the fastener, then match the type to the joint. That order avoids most returns.
In stock and sent from the US in one to two business days, free delivery over $59. Confirm the number before you order, because a near match will bolt on and still be wrong. Send the VIN if the old marking has gone.