New! OEM Genuine DeLonghi internal part of AC- 5551016400, NE1946  Window Bracket or internal part of window extension 5551016500. It is not full window bracket which is 2 pieces part. It is just back sliding part of this bracket without air vent hole and locking pin openings - never used and installed. 

Dimensions: 19 5/8” x 3 3/4” x 18/32”