Part Number: 141T6920-37 (Nlg aft door assembly)Part Number: 141T6920-39 (Nlg aft door assembly)Part Number: 141T6920-52 (Nlg aft door assembly)Part Number: 141T6920-56 (Nlg aft door assembly)Part Number: 141T6920-58 (Nlg aft door assembly)Part Number: 141T6920-66 (Nlg aft door assembly)