LEGO Gray Electric 9V Battery Box Cover 4x11x7 Part Piece # 59494 For 59510c01 | eBay
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LEGO Power Functions Battery Box with Beam Connectors with Black and Yellow Arrows Sticker (16511) | Brick Owl - LEGO Marketplace
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BrickLink - Part 59510c01 : LEGO Electric 9V Battery Box 4 x 11 x 7 PF with Orange Switch and Dark Bluish Gray Covers [Electric, Battery Box] - BrickLink Reference Catalog