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On the early D520, there was an rectangular door on the area under the left rear windowradio com
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Judging by these pics you posted with the gap in... the problem is with the wing interior. It is possible the wheel bays are too "tall" and disturbing at going deeper the bottom half of the wing into the fuselage. I would suggest fitting of the bottom wing part ( without these top halves ) to the fuselage firstly. I think you need to remove some of plastic from these wing roots and make edges of these wheel bays more rounded. Then you have to fit these top parts. Also I would suggest sanding the front edges of the fuselage at the area of the joint with the rasin nose. However you are right thet the part no. A10 should fill the gap and sanding of the fuselage won't be needed at all. Just check on its fitting.
Could you post a couple of pics of the fuselage taken from the below and the interior of the bottom wing part at the wheel bay areas?