I don't think the cockpit parts will be right for a Longbow, A and D IPs are quite different. As a guess, I'd say you can use seat straps, rotor, undercarriage, cable cutters, 'Disco' light, chaff/flare dispenser, wheels, rocket pod details, Hellfire missiles and launch rail assemblies.
You know the sponsons on the D are quite a bit different from the A, right?